Implemented new variables and methods regarding the mouse events

[iambiancafonseca]

Changes: lastButtonPressed; lastButtonReleased; lastButtonClicked; currentButton; mouseInteractions (Array); mouseInteraction (Class); setSizeInteractionsList();

Added other complementary auxiliary variables and methods; Added the correspondent unit tests for the new variables and methods; Added the necessary documentation to further test the new implemented variables and methods.

PR Checklist

• [x] npm run lint passes
• [x] [Inline documentation] is included / updated
• [x] [Unit tests] are included / updated