Added optional LUA callback at the beginning of a render cycle.
Added high precision support for shaders.
Merge pull request #58 from mindsnacks/feature/shader-precision

[FINAL] Added high precision support for shaders.
Merge pull request #57 from mindsnacks/feature/prerender-callback

[FINAL] Added optional LUA callback at the beginning of a render cycle.
Removing unneeded quotes to fix build
Adding arm64 to Valid Archs
Merge branch 'mindsnacks-dev' into feature/moai-ease