Flappy-bird-gymnasium

* Fix CLI
* Remove redundant code

**Changes**

- Fixed render mode
- Seed
- Unit tests
- Colorise agent's background

Thanks araffin and AndiLeni for contributions.

**New sensors:**
* the last pipe's horizontal position
* the last top pipe's vertical position
* the last bottom pipe's vertical position
* the next pipe's horizontal position
* the next top pipe's vertical position
* the next bottom pipe's vertical position
* the next next pipe's horizontal position
* the next next top pipe's vertical position
* the next next bottom pipe's vertical position
* player's vertical position
* player's vertical velocity
* player's rotation

**Updated model**

New features:
- pytest (updated CI)
- NEW CLI

New sensors:
- horizontal distance to the next pipe
- the next pipe's top vertical position
- the next pipe's bottom vertical position
- horizontal distance to the next next pipe
- the next next pipe's top vertical position
- the next next pipe's bottom vertical position
- player's vertical position
- player's vertical velocity
- player's rotation

v0.1.1-fix
New sensors:
* horizontal distance to the next next pipe
* difference between the player's y position and the next next hole's y position
* player's vertical velocity
* player's rotation