* Added a volume button.
* Moved the toolbar on top.
* Removed application menu.
* All dialogs use the headerbar.
* Removed deprecated functions:
* GTask instead of GSimpleAsyncResult.
* G_ADD_PRIVATE instead of g_type_class_add_private.
* GNotification instead of libnotify.
* Use meson instead of autotools.
Bugs fixed:
* Fixed crash after ejecting a CD.
* Automatically load rtl icon variants. (Laurent Bigonville) (#768451)
* Help: change wording in two sentences. (Anders Jonsson) (#757730)
* Added -fPIC -DPIC to CFLAGS (#777448)
