[easytag] (12 commits) Non-fast-forward update to branch wip/application-window

[David King <davidk src gnome org>]

The branch 'wip/application-window' 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:

  ceaca84... Refactor popup menu handling
  84c4ddf... Remove last uses of GtkAction
  ea126e6... Track main window state
  3a15c63... Save and restore main window state
  dfa909e... Move tag area to EtTagArea object
  33b5dbb... Move file area to EtFileArea object
  9399c16... Drop explicit call to gtk_main()
  11573a3... Remove unused code when closing preferences dialog
  f25e7bd... Remove the cancel button from the preferences
  192a141... Move dialog setting saving to application window
  cc0701b... Implement hiding of file header widget
  a1b34cf... Avoid warnings when reading and writing ID3 tags

Commits added to the branch:

  430e62b... Refactor popup menu handling
  63cda94... Remove last uses of GtkAction
  91d1cd3... Track main window state
  d5f6f81... Save and restore main window state
  a3c8a2e... Move tag area to EtTagArea object
  ba41391... Move file area to EtFileArea object
  cef0992... Drop explicit call to gtk_main()
  42e529c... Remove unused code when closing preferences dialog
  a5c3444... Remove the cancel button from the preferences
  06128c2... Move dialog setting saving to application window
  253f040... Implement hiding of file header widget
  931c3c9... Avoid warnings when reading and writing ID3 tags