…erg envs (#87)

* Add first version of refactored braitenberg env

* Add utils file

* Update way of computing forces in environment + Add general physics engine file

* Add first elements of tutorial on how to create an environment in a notebook

* Update braitenberg notebook and add new prey/predator braitenberg environment

* Delete new notebooks on refactored envs and associated files

* Add simple and prey_predator braitenberg envs in experimental directory

* Add first steps of sensorimotor functions refactoring

* Add first draft version of selective sensors braitenberg env

* Refactor simple braitenberg env and add utils file for all environments

* Update base env by removing intermediate state classes

* Remove duplicate code and add markdown comments

* Remove uncessary files

* Update simple braitenberg notebook

* Add behavior refactoring in simple braitenberg env

* Update simple braitenberg env and notebook with new init functions

* Add default values to init functions and update prey_pred notebook

* Add first version of refactored braitenberg env

* Add utils file

* Update way of computing forces in environment + Add general physics engine file

* Add first elements of tutorial on how to create an environment in a notebook

* Update braitenberg notebook and add new prey/predator braitenberg environment

* Delete new notebooks on refactored envs and associated files

* Add simple and prey_predator braitenberg envs in experimental directory

* Add first steps of sensorimotor functions refactoring

* Add first draft version of selective sensors braitenberg env

* Refactor simple braitenberg env and add utils file for all environments

* Update base env by removing intermediate state classes

* Remove duplicate code and add markdown comments

* Remove uncessary files

* Update simple braitenberg notebook

* Add selective sensors environment with old env interface

* Add manual mode in selective sensors and add some documentation

* Clean selective sensors imports and add notebook documentation

* Revert changes on non selective sensors environments