videodb: use strings instead of numbers in videodb:// URL
musicdb: use strings instead of numbers in musicdb:// URL
videodb: add GetItems() to retrieve a list of items of a specific type and media and GetItemById()
videodatabasedirectory: replace all the CDirectoryNode implementations that provide a list of grouped items into CDirectoryNodeGrouped
smartplaylists: add mixed grouping support
CSmartPlaylistDirectory: integrate mixed grouping
CGUIDialogSmartPlaylistEditor: integrate group options
CGUIWindowVideoBase: implement forced enabling/disabling of grouping into movie sets
musicdb: support filtering in GetYearsNav()
musicdb: add GetItems() to retrieve a list of items of a specific type and GetItemById()
CSmartPlaylistDirectory: add support for grouping to music smartplaylists
[confluence] add controls for grouping in SmartPlaylistEditor.xml