Simplifying Godot 3D character animation pipeline

[GeorgeS2019]

@smix8 just shared GodotAnimationRetargeting.

This repository "GodotBVHImport" requires remapping of bones during BVH import.

It makes sense that both projects need to harmonize perhaps to two addon or eventually one addon for importing animation from BVH (1)parsing, skeleton generation for (2)previewing imported animation and then (3)retargeting to a skeleton structure of interest.

[JosephCatrambone]

This is the first I've heard of it. Will take a look!