[gtksourceview] Non-fast-forward update to branch wip/chergert/snippets

[Christian Hergert <chergert src gnome org>]

The branch 'wip/chergert/snippets' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  8e2256a... snippet: implement basic snippet system
  c499a62... wip integrating snippet signals
  3ee35a0... start moving snippets mechanics outside of gtksourceview.c
  d09f4e5... start on some conversion to marks
  430b3f3... wip on new chunk design
  cb9c4d6... more work on switching to marks
  08ea0bd... add some debugging
  4b724f6... make snippet chunk a ginitiallyunowned
  6389d5b... make snippet use a queue of chunks w/ embedded list link
  915b0ce... cancel snippet if edit covers multiple snippets
  c9338d0... more cleanup on queue design
  0e0243e... consistent naming, fix some movement bugs
  6482185... fix text re-insertion
  ae446da... make this thing work

Commits added to the branch:

  45736e8... snippet: implement basic snippet engine