First serie of changes in DVD module for the forthcoming interface menus

 First serie of changes in DVD module for the forthcoming interface menus
 There is a new capability in input type modules for setting the
attributes of a new area. It is set to NULL for PS and TS plugins.
 It should be called for every title change, chapter change,
audio mode change or spu channel change.

But this part of code is not used at the moment, and is not completed
yet.