Fix visible tile algorithm
Add BlendEquation, BlendFunction and BlendingState
Fix BlendingState depends, partially implement GlobeSurfaceTileProvider endUpdate
Start implementing draw command creation, add Matrix4 tests, cope with swift array semantics
TileUniformMap type
Fix Rectangle default values
Fix Rectangle fromDegrees default values
Fix debug tuple
Implement TileImagery calculateTextureTranslationAndScale
Fix camera update code, try to work around compiler bugs