[SM64] Add gltf support to animations

[Lilaa3]

Introduce as much info as needed for a "compliant" animation converter, repo side. This is being done instead of other glTF impls for two reasons:

• One, I'm familiar with the full requirments for the animation exporter since i wrote my own and know the target audience.
• Two, RTYI (@KazeEmanuar) wants to do more advanced animations and I'm not adding support for hacky repo exclusive approaches any time soon.

This has the feature of porting over existing animation tables via reference, it does not attempt to manually fix the whole anims/ enviroment because that would take importing, which assuming a repo where this would be needed thats not an option, ideally a repo would have glTF to begin with and fast64 wouldnt have to handle anything.

Animations in glTF mode are basically identical to their C counterpart in settings, tho they allow you to reference a table via file instead of the c table names.
Two very early impls of FAST64_joint_sm64_geo and FAST64_scene_sm64_settings are also present. These are not and are not intended to be feature complete in this PR. The focus is allowing a repo to do exporting compliant to what fast64 does, nothing else nothing more.
There is some minor cleanups, only really in the animations folder for minor bugs and structure.

All things considered this is not a perfect implementation by any means and docs were kinda rushed.