Initial In-List-Drag&Drop framework
FileItemList::Move finished
Enable scrolling while drag&drop
Expose listitem.isDragged that is true, when a list item is currently dragged

Conflicts:
	xbmc/guilib/GUIBaseContainer.cpp
Inlist Drag&Drop for Favourites
In list Drag&Drop for Music Playlist
In list Drag&Drop vor Video Playlists
Skin Example 1
Drag&Drop scrolling improvement