syntax snips display properties inline
changed read-special to use procedures instead of promises
svn: r5534
original commit: 8ac1fe54e1ec645b50f31f05c6400435924cbd8b
updated to change in expansion of lexical variables
many UI updates and tweaks
improved syntax properties panel
added expand-only and expand/hide
added rudimentary textual stepper
fixed PR 8395 by adding snipclass for hrule-snip
fixed PR 8431: reductions and block splicing
fixed PR 8433: handling unquote and macro hiding w/ errors in hidden terms
svn: r5120
original commit: 056683743d998145deb4b2e82fa8fc73507ed7e3