Readability constraints

[sergiomrebelo]

This PR is related to developments of constraints evaluation. More detailed, it encompasses:

1. Development of readability constraints metrics: We have implemented and included two constraint metrics, namely legibility and Grid Size Appropriateness Measures. We developed the necessary testing Scripts using Jest (see issue Method to Measure Readability (constraints) #46).
2. Definition and Development of Constraint Evaluation Strategy: We have implemented a constraint evaluation strategy that employs Stochastic Ranking and a ranking tournament approach. Since we have refactored the tournament method, we modify the tournament method as refered in issue Modify the tournament selection method #52.
3. Development of Static Penalty Method: We have integrated a static penalty method to enable elite evolution, simultaneous to Stochastic Ranking. This method allows us to easier visualise the population increase on the interface.
4. Cypress Script for Evolution Testing.

[JJ]

LGTM, the rest is mainly advice and clarifications. You might want to open issues for whatever pieces of advice you deem worthy, or simply fix it before merging.