Blender Git Loki

Split the 'background and settings' panel in 3d window in 2 parts.
Instructions for how to add panels there:

- add a handler define code in BIF_space.h
- create a menu item that invokes a add_blockhandler()
- add to view3d_blockhandlers() the correct handler for it

- plus create a panel itself, just copy one... it needs some stuff
to get working, docs for that are for later