Apply IK data to characters

[philpax]

Whoo-boy. Assuming IK data has been produced either locally (#11) or from the network, it must then be applied to the characters. Several projects within the FF14 ecosystem already do this, including CM, Anamnesis, and more.

Our primary resource will probably be https://github.com/lmcintyre/posetest though (ty perchbird)

Potential concerns:

• Adapting the user's skeletal pose to that of their character. Somewhere out there is someone who's 2m tall who wants to play as a Lalafell, and more power to them. We will just need to figure out how exactly that works...
• Resolving IK data across multiple characters all dealing with separate latencies. Combined network / animation problem, this will require some brainstorming