MushroomRL-v.1.9.0

• Removed every Cython dependency, the package is easier to install now!
• Removed the humanoid environment, which depended on Cython
• Improved PyBullet environments
• New MuJoCo interface using native Deepmind MuJoCo bindings
• New air hockey environments implemented with MuJoCo
• The core now collects environment info and this info is passed to the fit method of the agent. This breaks the previous MushroomRL interface but allows supporting different kinds of algorithms (e.g. safe RL approaches)
• Improvements in the documentation
• Minor updates and bug fixes