MrEd 100 Framework revision

The framework is a streamlined version of the `mred:' names
from MrEd version 53.

Several of the old classes and proecedures are not longer in the
framework. Some have been eliminated and some have been moved out
into a separate application.

Subtle Changes:

 - get-edit -> get-editor
 - get-panel -> get-area-container
 - many other mred-sympathetic names changes

 - removing exit callbacks is accomplished by calling the procedure that
   exit:insert-callback returns

 - menus

 - the built in keymap functions no longer call: 
     add-editor-keymap-functions
     add-text-keymap-functions and
     add-pasteboard-keymap-functions
   automatically. Instead, the pasteboards and editor classes add them in.

 - the editor `auto-save?' ivar is now called `autosave?'
 - overriding `windows-menu' with #f no longer eliminates the windows
   menu. Now, it is an error.
 - mred:original-output-port, mred:original-error-port, and 
   mred:original-input-port are gone
 - mred:the-frame-groups method new-frame is gone. Use handler:edit-file 
   instead.
   
The eliminated classes are:

  :: classes that used to improve the wx: toolbox 
  :: interface and are no longer needed

  mred:button% 
  mred:check-box% 
  mred:choice% 
  mred:dialog-box% 
  mred:frame%
  mred:gauge% 
  mred:horizontal-panel%
  mred:list-box%
  mred:message% 
  mred:multi-text% 
  mred:panel% 
  mred:radio-box% 
  mred:single-panel% 
  mred:slider% 
  mred:text% 
  mred:text-window%
  mred:vertical-panel% 
  mred:media-canvas% 
  mred:connections-frame%
  mred:connections-dialog-box%
  mred:connections-media-edit%
  mred:connections-media-pasteboard%
  mred:connections-media-canvas%
  mred:connections-panel%
  mred:testable-button% 
  mred:testable-check-box% 
  mred:testable-choice% 
  mred:testable-dialog-box% 
  mred:testable-gauge% 
  mred:testable-list-box% 
  mred:testable-message% 
  mred:testable-multi-text% 
  mred:testable-panel% 
  mred:testable-radio-box% 
  mred:testable-slider% 
  mred:testable-text% 
  mred:testable-text-window% 
  mred:menu% 
  mred:menu-bar% 
  mred:menu-frame% 
  mred:media-text-edit%   (use a text-field%)
  mred:media-text-canvas% (use a text-field%)
  mred:media-multi-text%  (use a text-field% with 'multiple style)
  mred:canvas-message%    (use a message%)  

  mred:edit% (only the name alias is gone; mred:file-edit lives on)

  :: modes have just become mixins

  mred:basic-mode% 
  mred:mode%                       
  mred:scheme-interaction-mode% 
  mred:scheme-mode% 
  
  :: just use drscheme instead of these
    
  mred:console-edit% 
  mred:console-frame%
  mred:editor-frame%
  mred:transparent-io-edit% 

  mred:autoload

The moved functions and classes are:
  
  :: web browswer
  
  mred:hyper-basic-frame% 
  mred:hyper-canvas% 
  mred:hyper-edit% 
  mred:hyper-make-frame% 
  mred:hyper-view-frame% 
  
  :: graph
  
  mred:graph-pasteboard% 
  mred:node-snip% 

The remaining existent classes: 
  
  frame:empty% = (frame:make-empty% frame%)
  frame:standard-menus% = (frame:make-standard-menus% frame:empty%)
  frame:simple-menu% = (frame:make-simple-menu% frame:standard-menus%)
  frame:searchable% = (frame:make-searchable% frame:simple-menu%)
  frame:info% = (frame:make-info% frame:searchable%)
  frame:info-file% = (frame:make-file% frame:info%)
  frame:pasteboard% = (frame:make-pasteboard% frame:simple-menu%)
  frame:pasteboard-info% = (frame:make-info% frame:pasteboard%)
  frame:pasteboard-info-file% = (frame:make-file% frame:pasteboard-info%)

  text:basic% = 
     (text:make-basic% (editor:make-basic% text%))  
  text:return% = (text:make-return% text:basic%)
  text:searching% = (text:make-searching% text:basic%)
  text:info% = 
    (text:make-info% (editor:make-info% text:searching%))
  text:clever-file-format% = 
    (text:make-clever-file-format% text:info%)
  text:file% = 
    (editor:make-file% text:clever-file-format%)
  text:backup-autosave% = 
    (editor:make-backup-autosave% text:file%)
  text:scheme% = 
    (text:make-scheme% text:backup-autosave%)

  pasteboard:basic% = (editor:make-basic% pasteboard%)
  pasteboard:info% = (editor:make-info% pasteboard:basic%)
  pasteboard:file% = (editor:make-file% pasteboard:info%)
  pasteboard:backup-autosave% = (editor:make-backup-autosave% pasteboard:info%)
  
  editor-canvas:frame-title% = 
    (editor-canvas:make-frame-title% editor-canvas%)
  editor-canvas:wide-snip% =
    (editor-canvas:make-wide-snip% editor-canvas:frame-title%)

  panel:vertical-edit% = (panel:make-edit% vertical-panel%)
  panel:horizontal-edit% = (panel:make-edit% horizontal-panel%)
      
  snip:basic-style% = (snip:make-basic-style% snip%)
  snip:basic-style-media% = (snip:make-basic-style% media-snip%)

  frame-group:%

  match-cache:%

Old to new name mapping:

  mred:scheme-paren-pairs -> scheme-paren:paren-pairs
  mred:scheme-quote-pairs -> scheme-paren:quote-pairs
  mred:scheme-comments -> scheme-paren:comments
  mred:scheme-backward-match -> scheme-paren:forward-match
  mred:scheme-forward-match-> scheme-paren:backward-match
  mred:scheme-balanced? -> scheme-paren:balanced?
  mred:scheme-backward-containing-sexp -> scheme-paren:backward-containing-sexp

  mred:setup-global-keymap -> keymap:setup-global
  mred:setup-global-search -> keymap:setup-search
  mred:setup-global-file -> keymap:setup-file
	
  mred:global-keymap -> keymap:global
  mred:global-search-keymap -> keymap:serach
  mred:global-file-keymap -> keyamp:file

  mred:match-cache% -> match-cache:%

  mred:handler? -> handler:handler?
  mred:handler-name -> handler:handler-name
  mred:handler-extension -> handler:handler-extension
  mred:handler-handler -> handler:handler-handler
  mred:format-handlers -> handler:format-handlers
  mred:insert-format-handler -> handler:insert-format-handler
  mred:find-format-handler  -> handler:find-format-handler 
  mred:find-named-format-handler  -> handler:find-named-format-handler 
  mred:edit-file -> handler:edit-file
  mred:open-url -> handler:open-url
  mred:open-file -> handler:open-file
  
  mred:register-autosave -> autosave:register

  mred:make-exn -> exn:make-exn
  mred:exn? -> exn:exn?
  mred:make-exn:unkown-preference -> exn:make-unkown-preference
  mred:exn:unkown-preference? -> exn:unkown-preference?
  mred:exn:make-during-preferences -> exn:make-during-preferences
  mred:exn:during-preferences? -> exn:during-preferences?
  mred:exn:make-url -> exn:make-url
  mred:exn:url? -> exn:url?

  mred:insert-exit-callback -> exit:insert-callback
  mred:remove-exit-callback -> exit:remove-callback
  mred:run-exit-callbacks -> exit:run-callbacks
  mred:exit -> exit:exit

  mred:add-version-spec -> version:add-spec
  mred:version -> version:version

  mred:empty-frame% -> frame:basic%
  mred:standard-menus-frame% -> frame:standard-menus%
  mred:simple-menu-frame% -> frame:simple-menu%
  mred:searchable-frame% -> frame:searchable%
  mred:info-frame% -> frame:text-info%
  mred:info-file-frame% -> frame:text-info-file%
  mred:pasteboard-frame% -> frame:pasteboard%
  mred:pasteboard-info-frame% -> frame:pasteboard-info%
  mred:pasteboard-info-file-frame% -> frame:pasteboard-info-file%

  mred:media-edit% -> text:basic%
  mred:return-edit% -> text:return%
  mred:searching-edit% -> text:searching%
  mred:info-edit% -> text:info%
  mred:clever-file-format-edit% -> text:clever-file-format%
  mred:file-edit% -> text:file%
  mred:backup-autosave-edit% -> text:backup-autosave%
  mred:scheme-mode-edit% -> text:scheme% 
     (The new class is now implemented differently but has the same 
      functionality as the old.)

  mred:media-pasteboard% -> pasteboard:basic%
  mred:info-pasteboard% -> pasteboard:info%
  mred:file-pasteboard% -> pasteboard:file%
  mred:backup-autosave-pasteboard% -> pasteboard:backup-autosave%
  
  mred:wrapping-canvas% -> editor-canvas:wrapping%
  mred:frame-title-canvas% -> editor-canvas:frame-title%
  mred:one-line-canvas% -> editor-canvas:one-line%
  mred:wide-snip-canvas% -> editor-canvas:wide-snip%

  mred:vertical-edit-panel% -> panel:vertical-edit%
  mred:horizontal-edit-panel% -> panel:horizontal-edit%
      
  mred:snip% -> snip:basic-style%
  mred:media-snip% -> snip:basic-style-media%

  mred:frame-group -> frame-group:%
               
  mred:match-cache% -> match-cache:%

Mixins:

NOTE: some used but non-existant interfaces from mred engine:
      frame<%>, panel<%>, editor-canvas<%>, and text<%>.
      For now, these will use some "class derived from" predicate,
      with the corresponding engine classes. Perhaps later those
      interfaces will be added.

  frame:make-empty% : frame% -> frame:basic<%>
  frame:make-standard-menus% : frame% -> frame:standard-menus<%>
  frame:make-edit% : frame:empty-standard-menus<%> -> frame:edit<%>
  frame:make-searchable% : frame:edit<%> -> frame:searchable<%>
  frame:make-pasteboard% : frame:edit<%> -> frame:pasteboard<%>
  frame:make-info% : frame:empty<%> -> frame:info<%>
  frame:make-edit-info% : (interface (frame:info<%> frame:edit<%>)) -> frame:edit-info<%>
  frame:make-file% : frame:edit<%> -> frame:info-file<%>
  
  ; editor:make-basic% adds keymap support, error checking on load-file
  ;      run-after-edit-sequence, locked?, get-edit-snip, 
  ;      get-pasteboard-snip, sets up parents for get-file and put-file
  editor:make-basic% : editor<%> -> editor:basic<%>
  editor:make-info% : editor:basic<%> -> editor:info<%>
  editor:make-file% : editor:basic<%> -> editor:basic<%>
  editor:make-backup-autosave% : editor:basic<%> -> editor:autosave<%>
  
  ; text:make-basic% adds ranges, wrapping, move/copy-to-edit
  text:make-basic% : (interface (editor:basic<%> text<%>)) -> text:basic<%>
  text:make-return% : editor:basic<%> -> editor:basic<%>
  text:make-searching% : (interface (editor:basic<%> text<%>)) -> text:searching<%>
  text:make-info% : (interface (editor:basic<%> text<%>)) -> (interface (editor:basic<%> text<%>))
  text:make-clever-file-format% : text<%> -> clever-file-format<%>
  text:make-scheme% : (interface (editor:basic<%> text<%>)) -> editor:scheme<%>
  
  editor-canvas:make-frame-title% : editor-canvas<%> -> editor-canvas<%>
  editor-canvas:make-wide-snip% : editor-canvas<%> -> editor-canvas:wide-snip<%>
  
  panel:make-edit% : panel<%> -> panel:edit<%>
  
  snip:make-basic-style% : snip<%> -> snip<%>

  scheme:make-text% : text:basic<%> -> scheme:text<%>
