Feature request: Per-vertex biome color smoothing

[yavincl]

trafficstars

Just thought that Sodium's biome blending looked way better than Vanilla's. Someone in a modding discord explained to me that Sodium had per-vertex smoothing rather than per-face, leading to a non blocky look to the smoothed colors.

[grondag]

This is already implemented for fluids and will be added for blocks.