use bsp/pvs-based visibility data for acceleration:
+ fps 5 -> 60
- correctness: some areas have too many lights, which ends up culling visible ones too
also fix shadow artefacts
not all beam types are supported yet
also changes studio api init sequence, fixes missing cvars
vertex type struct is no longer names as brush-specific
uniform buffer allocation is now in vk_render
blending issues still remain
Lightstyles remain fixed for the entire map duration. Need to implement either texture reupload in VK, or devise some other scheme of updating ligtmaps w/o texture reupload (lightstylevalues uniform buffers?).
