feat(manikin-tools): add manikin tools

[HuJohner]

Adds an improved version of the SkinnedMeshHelper known from the ManikinTools to the editor of ManikinSmrPart:

SetSmrBonesFromHashes: Useful if you have a correctly set up part but somehow lost the bones in the SkinnedMeshRenderer. This will restore the bones

Single bone: This allows you to set up a mesh to follow a single bone. This is the simplest way to get simple stuff like helmets to work.

Transfer Bones: This is where it gets more complex but is powerful. This allows you to copy the bones from one or more reference SkinnedMeshRenderers.