[gtksourceview] (23 commits) Non-fast-forward update to branch wip/loader-saver

[Sébastien Wilmet <swilmet src gnome org>]

The branch 'wip/loader-saver' 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:

  9f90b96... File loading and saving
  b0a3f06... Move some enum types to gtksourcetypes.h
  147db27... build: rename helper library private -> core
  be84bdd... encoding: comment unused functions
  1652ea7... GtkSourceEncoding documentation
  1a40400... Some code improvements
  2460450... GtkSourceFile, the come back
  4081c0a... Move mount_operation_factory to GtkSourceFile
  8f494c3... Add missing GI annotation
  9d662ee... FileSaver: add setting: ignore invalid chars
  5265eb7... File saving: check if the file is externally modified
  aa22b0b... FileSaver: flags instead of boolean properties
  05da159... FileSaver: use IGNORE_MODIFICATION_TIME flag
  77702e8... Make GtkSourceMountOperationFactory introspection-friendly
  9b061c7... Make load_async() and save_async() introspection-friendly
  3dbd7ca... Make gtk_source_file_set_location() public
  7d46184... Make BufferOutputStream more robust after dispose
  4e2016f... FileLoader: update GtkSourceFile location directly

Commits added to the branch:

  ca88f55... gutter: use connect-after for the view's draw signal (*)
  001412f... Release 3.13.1 (*)
  673f4e0... Post-release version bump (*)
  219ddb5... automake: Add AM_TESTS_ENVIRONMENT as a keyword (*)
  31dc73a... CompletionContext: dispose() gracefully on buffer change (*)
  62b3cec... File loading and saving
  afe5f3f... Move some enum types to gtksourcetypes.h
  d72bab2... build: rename helper library private -> core
  d751b87... encoding: comment unused functions
  a4481e0... GtkSourceEncoding documentation
  f8c0e4d... Some code improvements
  25cd837... GtkSourceFile, the come back
  c0114f9... Move mount_operation_factory to GtkSourceFile
  69c1912... Add missing GI annotation
  b662a7d... FileSaver: add setting: ignore invalid chars
  e890e64... File saving: check if the file is externally modified
  fa4e016... FileSaver: flags instead of boolean properties
  551039a... FileSaver: use IGNORE_MODIFICATION_TIME flag
  ae68087... Make GtkSourceMountOperationFactory introspection-friendly
  acdd520... Make load_async() and save_async() introspection-friendly
  2d8ad8e... Make gtk_source_file_set_location() public
  2269c86... Make BufferOutputStream more robust after dispose
  e7cf904... FileLoader: update GtkSourceFile location directly

(*) This commit already existed in another branch; no separate mail sent