show message box if user wants to use a different closing angle!=0

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@911 14438d79-0ffd-4333-8ae7-ea2bdd901387
fix some potential bugs & use performance hints (found by PVS)

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@912 14438d79-0ffd-4333-8ae7-ea2bdd901387
Light rendering optimized more.
Forgot to remove some TODOs which are done.
Many simplifications and optimizations to gate rendering.
Disabled Graphics Memory display during F11 for now.
Implemented vertex buffer caching.
Forgot to mention screen shake.
Merge branch 'master' into fixes
Merge branch 'fixes' into dev

Conflicts:
	flipper.h
	pin/player.cpp
	pin3d.cpp