Add more commands
Release 2.0.0

1. Add 3 new character models and textures
2. Add Phong shading
3. Use TGA textures
4. Add more console commands
5. Faster and more reliable model loader
6. Replace BMP image loader with TGA image loader
7. Fix OpenGL and other memory leaks
8. Rename class Player to Character
9. Add more Character functionalities
10. Update readme