Spine runtime for FRAG

[zacharycarter]

2 options being explored -

1. Wrap existing C Spine runtime

• Will force us to include Spine runtime license with project, but project can be optionally included with FRAG so FRAG can stay spine runtime license free
• Faster and easier

2. Write our own runtime

• Not fast, not easy
• WIP atm, working on parsing skeleton and texture atlas data
• Will need extensive testing to verify results against spine samples

Out of the two options, I'm much closer to achieving # 1. I think if I took another shot at creating bindings I could probably have something working in a day or two.

`# 2 is more appealing though, so I'm working on that. If I encounter roadblocks I may switch back to # 1.