1. add a way to enable only certain lights
2. add commented out code to highligh affected light clusters, culling
modes, etc.
3. add affected light clusters counter when collecting lights
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
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?).
