Added framework for degradables.
Integrated IDegradable into the Environmental Accumulator.
It has a basic implementation of terraforming.
Finished the behavior of the terraform degradation.
Added nauseate degradation.
Added mob spawn degradation effect.
Added degradation effect that will play sounds.
Added knockback distort degradation effect.
This includes some enhancement to the common distort logic.
Added degradation particles.
Added wildcard terraform degradation blocks.
Made sure terraforming can not remove the envir acc.
Added biome degradation.

This includes:
* Configurables for biomes
* Algorithm for organic spreading.
* Degraded biome.
Enhanced the degrading particles for more random motion.
Added terraform block replace limitations.
Blocks with tile entities or unbreakable blocks can't be replaced
anymore.
Made Degradation Effects configurables so that they can be disabled.
Fixed small server crash in the Particle Degradation effect.
Rewrite of the environmental accumulator, closes #60
Added recipes for environmental accumulator to CustomRegistryRecipe and changed item rendering, close #19, close #71, close #83, close #84
Added Inverted Potentia recipe to the Envir Acc.
Improved Environmental Accumulator rendering. Closes #86.
Merge branch 'version-1.6-0.4.0' into version-1.6-0.4.0-degradation