vkQuake optimizations & server/client rate independence

[Novum]

• Performance is much improved on my Ryzen machine. I doubt this will be different on Intel, but maybe do some tests if possible. I used ad_sepulcher because it's one of the most complex maps. Try going out of bounds too (I get 60 instead of 40 FPS now)
• I tested with VC++ 2019. Not sure if the compiler matters much.
• The server/client independence includes the fix for ambient sounds not playing if frame rate is too high. All credit goes to Spike.
• New max FPS is 200 like in vkQuake. I think that's reasonable.