Enabled ListField navigation via arrow keys.  Moved some Input logic from the EditorScreen to the respective EditorComponents that need it. Confirming changes / discarding sprites in the SpriteSheet view now works. (Also, the list entries have a coloured label for better discrimination).  when performing one of these actions, the list entry will be removed from the other list.
Enabled ListField navigation via arrow keys. 
Moved some Input logic from the EditorScreen to the respective EditorComponents that need it.
Confirming changes / discarding sprites in the SpriteSheet view now works. (Also, the list entries have a coloured label for better discrimination).
 when performing one of these actions, the list entry will be removed from the other list.


git-svn-id: ae8f550ee6115c0c293225b5d77740e804e1cba7@2178 16493bb7-3577-b145-b9c3-72a97d279fb6

gurkenlabs/litiengine,gurkenlabs/litiengine