* Refactor ColumnFlow so that it uses insert/removes instead of resetting the view
* Add search support to MusicAlbums.qml MusicArtists.qml MusicGenres.qml MusicPlaylists.qml MusicTracks.qml MusicaddtoPlaylist.qml
* Remove any references to sheets as they have been removed. Fixes: https://bugs.launchpad.net/bugs/1297253, https://bugs.launchpad.net/bugs/1301893, https://bugs.launchpad.net/bugs/1332877, https://bugs.launchpad.net/bugs/1342928.
Approved by Victor Thompson, Ubuntu Phone Apps Jenkins Bot.