Bugfix: made invisible gates not render.
Made backglass objects render last.

This is purely a VP9 compatibility hack. It fixes the Homer head
on TSPP not rendering properly.
Implemented VP9 lights draw order emulation.
Some improvements for rendering of T2 Chrome.
Put cullmode CCW into the default render state and made it consistent everywhere.
Enabled ball monitor stretch mode for windowed fullscreen.
Updated list of DX9 issues.