UV map extractor

[leandroarndt]

Create a UV map extractor and (possibly) paint each mesh with different colors to aid texture editing and visualization inside the simulator.

Interesting resources on this:

1. glTF references:
   • Mesh
   • Mesh Primitive
   • Buffer View
   • Material
   • Texture
   • Texture Info
2. Pillow:
   • ImageDraw
3. Other:
   • How mesh geometry data (vertex coordinates) stored in glTF?
   • msfs2blend source

[leandroarndt]

Switched glTF development to a fork of the official Khronos Blender importer at https://github.com/leandroarndt/glTF-Python-IO

[leandroarndt]

3afe713ed6de3ae2af3881b7be28b1bc7033ac38 solves this. Needs to be implemented at GUI.

[leandroarndt]

f0662cc9143ab763d37b34836fa313bcd35616ce implements at GUI.