v0.2-alpha

Adding support for the latest Nima features.

• Full character hierarchy.
• IK target solver.
• Skinned Meshes using Unity's native render path.
• Vertex deformed meshes.
• Custom shaders for pre-multiplied alpha path with support for all blend modes.
• Full animation pipeline with mixing support.
• Example character and controller.
• Minimal memory impact sharing as many mesh resources and data as possible across character instances at the cost of changing render states. Need to better investigate whether a more memory & CPU intensive path re-generating a full character mesh on change is more effective on underpowered GPUs.