59 quad env

[ArzhelaR]

Add a quadrangular gymnasium environment with flip, split and collapse actions. The cleanup action is coded but not used in the learning process.
Creation of a new personal PPO model "PPO_model_pers" adapted to the gymnasium quad environment.
Add an observation register on the quad environment to count the number of times an observation is seen by the RL agent.
File reorganisation.
#59 fixed

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.88% (target: -1.00%)	✅ 90.62%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (018b517)	1088	951	87.41%
Head commit (d03b829)	1562 (+474)	1379 (+428)	88.28% (+0.88%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#60)	682	618	90.62%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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