Remove r_HeatHazeFix that noone uses anyway
Remove light/entity/interaction occlusion culling

1) Never enabled
2) Was badly implemented as it caused a GPU sync
3) AFAIK not what engines should do nowadays
GLSL function declarations should be after the compile macros
Remove CVAR_ARCHIVE cgame variables
Load the map when playing a demo
Add support for the "colorGrade" world spawn key
Fixes #473
Figured out the difference between SERVERINFO and SYSTEMINFO
Remove some redundancy and reorder SV_DropClient
Remove arg of BotAllocateClient and introduce SV_IsBot
Remove unused declaration and vars
Fix a copy paste error
Merge branch 'master' into nacl-cgame/main