[0.3-dev] Implement temperature/humidity 2D texture system for more variety

[EepyBerry]

Issue information See title.

Reasoning behind proposed enhancement(s) Not very easy to implement, but allows for much more variation with virtually infinite biomes (as long as the device can handle it)

Additional details

• Texture generation algorithm should be rewritten for the additional dimension
• Ditch color ramp for a single color per biome
• Figure out smoothing between biomes (keep ramp alpha? gaussian blur?)
• Limit texture size to a resaonable amount (512 max, more is unnecessary)

[EepyBerry]

[67af4e9]: Currently working without smoothing, current implementation details:

• texture size: 256x256
• single color per biome
• supports as many biomes as wanted (not tested yet, at least 5 without issues)
• smoothing calculations take texture minmax into account (make that configurable ?) (WIP)

Next step: finish smoothing and reduce uniforms on planet fragment as much as possible

[EepyBerry]

[5b0d5fe]: Smoothing implemented, uniforms greatly reduced as well. Release to come later this week.