Added optional, but only semi-functional, alpha-to-coverage support.
Added mipmapper to test Lanczos scaling.
Fixed whitespaco.
Implemented depth fog for water bottoms.
Added depth fog for objects rendered on water tiles.
Better water surface.
Improved water surface a bit further.
Use a generic attribute-layer for constructing water depths.
Added a few more water surface variants.
Made the waterfog stuff optionally selectable.
Adjust the waterfog color with the ambient lighting.
Turn on mipmapping for tiles (but only using NEAREST filtering).
Merge branch 'waterfog' into core
Use FBOs for GBuffers and share GL contexts between several such.
Allow loading events from composition to properly propagate to avarender.
Make it possible to wait for deferral exceptions.
Make it possible for textures to throw loading-exceptions from fill().
Added a new texture resource layer that decodes and mipmaps itself lazily.
Remember to properly mipmap TexRs and set their parameters.
Split the functional parts of TexR to a reusable TexL.