Fixed WorkshopDL not mounting gamemode files
Fixed Male Citizen player model mounts
Added `screenspace_general_8tex` shader
* This is the same as `screenspace_general`, but binds 8 texture samplers
* This is an experiment in shader inheritance
* material parameters: $TEXTURE4 - $TEXTURE7, $LINEARREAD_TEXTURE4 - $LINEARREAD_TEXTURE7
Entity:SetCollisionGroup allows HL2 collision groups
Added COLLISION_GROUP_HL2_SPIT enum