main: Remove drop support from playlist
main: Modify totem_object_add_to_playlist_and_play()

Rename totem_object_add_to_playlist_and_play() to
totem_object_add_to_playlist(), and pass whether to play
the added media as an additional parameter.
grilo: Update for add_to_playlist() API change
grilo: Add Selection toolbar
grilo: Add missing chain up in TotemMainToolbar
grilo: Add selection toolbar

And hook up Play and Shuffle.
main: Don't set the waiting cursor on the playlist
main: Remove shuffle setting

We now have a shuffle button in the grilo plugin, to allow
shuffling the selection.
dbusservice: Update for shuffle setting API removal
lirc: Update for shuffle setting API removal
media-player-keys: Update for shuffle setting API removal