[easytag] (16 commits) Non-fast-forward update to branch wip/mingw-fixes

[David King <davidk src gnome org>]

The branch 'wip/mingw-fixes' 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:

  4b25015... Fix context menu shortcut in NSIS installer
  552e4e4... Use g_spawn_async() on Windows

Commits added to the branch:

  1a9f7b7... Updated Polish translation (*)
  2351757... Updated Czech translation (*)
  7f4d721... Fix context menu shortcut in NSIS installer (*)
  ea8396a... Remove Quit action from toolbar (*)
  7bfab61... Do not override the primary toolbar style (*)
  15fc326... Check for a valid iter in Browser_Tree_Select_Dir (*)
  16a66de... Check iter in Browser_Tree_Rename_Directory (*)
  d7bda2d... Add estimated size to NSIS installer (*)
  ae3dd7b... Fix two memory leaks in scanner (*)
  09f96fd... Fix memory leak in et_get_file_size() (*)
  aa8fb4b... Remove a bogus GtkTreeIter assignment (*)
  b93a38b... Remove bogus conditional check (*)
  2ab5050... Remove a bogus sign check (*)
  a220a6d... Use g_format_size() instead of custom code (*)
  81a1e7c... Only add dummy browser row if the path is readable (*)
  65930ef... Use g_spawn_async() on Windows

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