…o be investigated

…d enums removed from robot. model as string accepted to create a scene. All tests passing on the different gym versions. All tests passing on all tutorials

…. Pinning back the gym version.

Merge pull request #129 from MyoHub/add_gymz_vk
- Gym/Gymnasium import.
- Examine_sim upgraded to mujoco bindings
- Hardcoded enums removed from the robot.
- Model as a string accepted to create a scene.
- All tests passed on the different gym versions.
- All tests passing on all tutorials