[easytag] (16 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:

  9ff7a13... WIP avoid using filename_to_display()
  fba3796... WIP Avoid using filename_from_display()

Commits added to the branch:

  ecf346d... Fix redefinition warning in Windows compat code (*)
  a2d8e7a... Fix redefinition warning from TagLib (*)
  bec4bdd... Update NEWS for 2.3.4 release (*)
  54ba8cf... Add checks for extra id3lib declarations (*)
  5b8659a... Return a value from et_artist_album_list_add_file (*)
  5df5c61... Add missing break in playlist dialog switch (*)
  69f6bb5... Fix format warnings caused by incorrect sign (*)
  1a775b1... Updated Polish translation (*)
  70e049b... Updated Czech translation (*)
  6879d49... Updated Turkish translation (*)
  e3f197a... Fix CDDB requests being truncated (*)
  dd7ee20... Handle empty descriptions in ID3 tag artwork (*)
  7c2d646... Fix memory leak in artwork types dialog (*)
  8f4cd65... Correctly update the artwork description (*)
  97ffae2... WIP avoid using filename_to_display()
  76d5258... WIP Avoid using filename_from_display()

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