scintilla: use CustomEvent rather than xtk.domutils.fireDataEvent

(integrated from trunk branch change 4469fea by Todd Whiteman <toddw@activestate.com>)
codeintel: use CustomEvent rather than xtk.domutils.fireDataEvent

(integrated from trunk branch change 69377f5 by Todd Whiteman <toddw@activestate.com>)
views-buffer: use CustomEvent rather than xtk.domutils.fireDataEvent

(integrated from trunk branch change 7b61e19 by Todd Whiteman <toddw@activestate.com>)
views-buffer: use CustomEvent rather than xtk.domutils.fireDataEvent (part 2)

(integrated from trunk branch change 58c802c by Todd Whiteman <toddw@activestate.com>)
views-buffer: is no data variable in this scope

(integrated from trunk branch change 23ca6d0 by Todd Whiteman <toddw@activestate.com>)
codeintel: update "codeintel_userlist_selected" to use CustomEvent

(integrated from trunk branch change 1223aef by Todd Whiteman <toddw@activestate.com>)
editor: update "file_saved" event to use CustomEvent

(integrated from trunk branch change cf42679 by Todd Whiteman <toddw@activestate.com>)