FinalIK Fixes

[VirtualBrightPlayz]

Next steps: adding an offset to the hand/palm positions

[200Tigersbloxed]

This is a great WIP PR! The hand and head rotations work excellent! Unfortunately there are other problems.

1. The first obvious one is the hips are still jank. Turning your head causes the hips to rotate very drastically.
   • This should be fixed with some configuration value, but I'm unsure
2. Hands are incredibly offset. Even just applying an offset of (0.1f, 0, 0) provides the following output on all avatars

Notice how the hands are on two completely different levels, despite the controllers being side-by-side in real life.

3. Head is still locked on y. You can replicate this by trying to look all the way up and eventually your head will no longer look so far up.
   • I believe this is an issue with our current animations, so I will look further into that.