Clean up client fx code.

Remove meaningless comments. Remove dead code. Don't pre-register models
not referenced by client. Simplify beams management code.
Improve ‘gl_shadows’ drawing.

Don't project shadows on too steep slopes (> 60 degress). Don't project
laser model shadow.
Merge branch 'master' of git://github.com/AndreyNazarov/q2pro
Updated client version