Terra

This version adds full support for 3D biomes in the following addons:

• 3D Noise Chunk Generator (3D biomes are sampled for noise)
• Feature Generation Stage (Feature generator uses ranges in biome columns to place features)

A number of optimisations regarding 3D biomes were added:

• Addition of "biome columns" to avoid repeating expensive 3D computations
• Optional override for a BiomeProvider implementation to return a "base biome" used in biome columns
• More advanced biome caching
• Finer control over biome caches

Several other general-purpose optimisations were added:

• TerraScript backend was rewritten to store LVs in an array-based table with reference and store nodes containing table indices, rather than storing in an ID-based hashmap
• 3D Noise Chunk Generator was optimised to avoid biome lookups when possible
• Adjacent palette locators no longer instantiate 4 extra Column instances
• Iteration over Range using foreach was replaced with index-based iteration in hot code.

This version also adds a new core addon, the Biome Extrusion Provider.

The Extrusion Provider takes another biome provider as a parameter, which it uses as a "base." Through "extrusion" layers, 3D biomes are inserted on top of the base biomes.

This release also fixes a Minecraft bug where bee entities access the world random instance upon instantiation, which during worldgen can potentially cause an exception due to a race condition (Fixes #327)