Flygym

- Modify model file to support MuJoCo 3.1.1
- Remove support for Python 3.7 (too old; not supported by MuJoCo 3.x.x)
- Remove support for Python 3.12 (too new; not supported by Numba)

See 101

- Fixed bug related to now deprecated automatic adhesion control
- Modified ball placement in the tethered environment

- Changed default joint kp and adhesion force to those used in the controller comparison task
- Fixed bug in the dimension of the contact force array when correcting contact forces for adhesion forces
- Fixed bug in the definition of the action space when adhesion is enabled
- Add tutorial on CPG controllers
- Fixed errors in installation instruction

See 77

- Rename NeuroMechFlyMuJoCo->NeuroMechFly, MuJoCoParameters->Parameters
- Update website, doc structure etc

We have restructured the package and updated the API references. New users should use this version.