[easytag] (7 commits) Non-fast-forward update to branch wip/core-refactoring

[David King <davidk src gnome org>]

The branch 'wip/core-refactoring' 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:

  afa692a... Refactor function to check if all files are saved
  d880f12... Refactor file list freeing functions
  0b5f299... Refactor artist album file list functions
  75100c4... Remove unused displayed list function
  e2a68c4... Refactor several file list functions
  11bcabd... Remove several unused functions

Commits added to the branch:

  93b17ae... Simplify GtkFileFilter creation (*)
  39497fb... Refactor function to check if all files are saved
  dec23ac... Refactor file list freeing functions
  6ca07ac... Refactor artist album file list functions
  e9f95c4... Remove unused displayed list function
  b99b784... Refactor several file list functions
  c4bbdca... Remove several unused functions

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