* Fixed Gym environments changing actions list in-place during call to `step`
* Added info on game winner to ending state
* Added rotation matrix of players' groins to game state
* Added velocities of body parts to game state
* Added "get_normalized_locations" function to game state
* Added normalization to Gym environments
* Added new duo-combat environment with winning reward (rather than injury reward)
* Torille now attempts to make stderr.txt file read-only to avoid huge files (on Linux/Darwin)
* Added code of new experiments to `experiments` folder