add TransformController.setSharedLocalToWorldTransformReference() and TransformController.setSharedWorldToLocalTransformReference() to share Matrix4x4 references and avoid copies
use TransformController.setSharedLocalToWorldTransformReference() and TransformController.setSharedWorldToLocalTransformReference() to share the Matrix4x4 references used in the data binding
minor refactor of SkinningShaderPart to avoid useless operations
fix coding style