Diversify the map with new biomes

[mayant15]

MetalRenegades uses the default BiomeProvider, which takes surface height, temperature and humidity at a point and defines a biome at that point. As of now, the temperature and humidity is fixed at 0.6f and 0.1f respectively, here and here.

The goal is to change these hardcoded values to random values weighted in a way that the biome we get is mostly desert. Some ideas may be found in this StackOverflow thread

[agent-q1]

I'd like to have a go at this! But, there should be a way of ensuring that the Temperature function is continuous and differentiable.