Enable scrolling while drag&drop
Initial work to get inlist drag&drop for favourites
Expose listitem.isDragged that is true, when a list item is currently dragged

Conflicts:
	xbmc/guilib/GUIBaseContainer.cpp
In list Drag&Drop for Music Playlist
pick 24df078 Enable scrolling while drag&drop
Skin Example 1
FIXUP: visualise only when in list dropping