I feel like I'm going to accidently reset my git history...
Minor: update _Static_asserts to ensure CHUNK_SIZE_* are > 0
exposedToAirOnTop field was removed
Re-enable sunlight generation.
Another place where exposedToAirOnTop needed to be removed.
Calculate outside/inside for cube-chunks in GSChunkSunlightData.

BUG: sunlight propagation (flood-fill) doesn't work and is disabled
Fix sunlight propagation.
Sped generation up with a bulk API for -straightShotToTheSkyAlongColumn:
Add some terrain generation fast paths for points above the ceiling.
-tryToGetChunkVoxelsAtPoint:chunk: should set allowAsyncCreate=YES
Fix deadlock in GSGrid which occurred on -resizeTable.
Remove artificial restrictions on camera and edit altitudes.
Less verbose logging in GSChunkSunlightData.