unstable: added class-iop, gui/prefs (needs doc), gui/notify (needs doc)

macro-debugger: changed imports for above, deleted dead code

svn: r16781

original commit: 2051f3ab2a2cfe9768ed9987c7cd9d00abb0aa8e

collects/unstable/gui/notify.ss

@@ -3,7 +3,6 @@
 (require (for-syntax scheme/base unstable/syntax)
          scheme/list
          scheme/class
-         macro-debugger/util/class-iop
          scheme/gui)
 (provide define/listen
          field/notify

collects/unstable/gui/prefs.ss

@@ -0,0 +1,13 @@
+
+#lang scheme/base
+(require (for-syntax scheme/base)
+         framework/framework)
+(provide pref:get/set)
+
+(define-syntax pref:get/set
+  (syntax-rules ()
+    [(_ get/set prop)
+     (define get/set
+       (case-lambda
+         [() (preferences:get 'prop)]
+         [(newval) (preferences:set 'prop newval)]))]))