Add dynamic material (change, load texture to mesh at runtime)

Add aces for runtime Load material (load texture from png), Set mesh to material (set mesh to texture), Delete material (delete dynamic loaded material/texture).

See the example 3DGLBLoadMaterial.c3p for usage.

Add Set origin x/y (to center bounding box in x and y as needed.)

Recommendations:

• Keep textures small
• When designing models, dedicate a single texture map to meshes that will change the texture (e.g. a face with expressions). In this case it can be a good idea to have multiple textures per model.

Also contains a rotation animation fix for unskinned nodes.

To see what meshes and materials are available, examine your model using https://sandbox.babylonjs.com/