Tutorial on how to use bones as sockets to calculate the position of something.

* add GLTF animation support

* use correct index when allocating animVertices and animNormals

* early exit LoadModelAnimationsGLTF if the gtlf file fails to parse

* update models/models_loading_gltf.c to play gltf animation

Updated the .blend file to use weights rather than bone parents so it
fits into the framework. Exported with weights to the .glb file.

* fix order of operations for bone scale in UpdateModelAnimation

* minor doc cleanup and improvements

* fix formatting

* fix float formatting

* fix brace alignment and replace asserts with log messages

Added a simple cube with vertex colors for testing both.