Ensure Good Collision With Physical Bones of Arm1 (Level 4)

[emanisgrand]

1. Remove Unnecessary Bones.
2. Adjust Colliders / Collision Matrix

[emanisgrand]

1. Through the use of BoneAttachment3D, I was able to isolate which specific bone I want to manipulate in the hierarchy.
2. I attached a RigidBody3D to that (with its CollisionShape).
3. I locked the Y axis of that node so that it wouldn't fall.
4. Layered on 2 and Masking for collision on all layers (1:skeleton/2:walls/3:collider)

The result is mostly everything I envisioned. The only thing that may come up later is rag doll collision isn't quite working with the Rigid Body.