[easytag] (6 commits) Non-fast-forward update to branch wip/xdg-app

[David King <davidk src gnome org>]

The branch 'wip/xdg-app' 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:

  8846168... Rename desktop file to match application ID
  52d7bbe... Rename icons to match applicatioin ID

Commits added to the branch:

  dfb03ab... Improve MP4 empty field handling (*)
  ac66630... Use et_str_empty() when writing MP4 tag fields (*)
  3b4766f... Improve MP4 album artist support with newer TagLib (*)
  491ec98... Rename desktop file to match application ID
  caf0758... Rename icons to match application ID
  7df9b84... Rename AppData file to match application ID

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