[Xcb] Pushed a bunch of protocol updates

[Ian Osgood]

composite.xml 0.3
render.xml 0.10
xfixes.xml 4.0
screensaver.xml 1.1

Please review and test the new functionality. (Was screensaver ever  
tested? It appeared to have lots of structure and padding problems.)

I changed a Render structure name from TRAP to TRAPEZOID, since a new  
TRAP structure was introduced. rendertest.c was fixed to match.

I also cleaned up mask enums to use <bit>.

Does anyone know if there are other extensions that have been updated  
in the last year?

Ian