Properly separated ocean and lake topologies
Fixed players sometimes spawning next to lakes
Fixed lighthouses sometimes spawning on lakes
Fixed lakeside decor sometimes spawning next to ocean
Refactored splat and biome maps to natively support bit masks in their getters
Refactored the way terrain colors are sampled to support one color per splat per biome
Added BlendTexture class that blends two textures together (replaces BlentLUT)
Added all functionality of AtmosphericBlend to Climate (blending now uses biomes)
Removed AtmosphericBlend and BlendLUT
Made paths and rivers store height values when assembling the point lists
Doubled river vertex density
Increased maximum river trace distance
Some refactoring and cleanup
