Build shade texture independently from voxel space, and improved shade texture calculations
Rebuild shade texture independently from cloud voxels
Apply elevation constraints to boundaries of tiles
Store density rather than transmission in shade texture
Fix fgelev to handle shores and airport edges
Fix fgelev to handle shores and airport edges
ReaderWriterSTG: remove very noisy log message
Remove fgmeta/ws30. ws30 tooling now hosted at flightgear/ws30