Fix for multiplayer with non basic mode.
Fix srgb mismatch
Fix turning behaviour (karts would turn a lot more than with
previous stk versions, which resulted in hard controlling karts
(esp. at higher speed).
Merge branch 'master' of github.com:supertuxkart/stk-code
Use glClientWaitSync with a 0 timeout

It turns out to be much more responsive this way.
Use ProjectionViewMatrix in glow_object.vert
Add profier marker for updatePhysics
Fixed parameter names and missing / in URL (which is required).
Merge branch 'master' of github.com:supertuxkart/stk-code
Avoid crashes on server side by supplying (unnecessary) values like
os_win=0 on linux etc. Added more opengl data to keep the server
happier ... though not yet entirely happy ;)
File missing in previous commit.
Added gfx_drv_ver and gfx_vard to hardware report.
Turn sfx_manager into a singleton.
Removed old/unused declaration.
Move m_sync
Removed unnecessary static variable.
Added comments.
commenting out an unused function which only throws deprecation warnings
Queue up sfx instead of starting them immediately. Preparation for
threading the sfx manager.
Merge branch 'master' of github.com:supertuxkart/stk-code