Added interactable system for objects detecting an interactable state

[nicholas-maltbie]

Description

Added the interactable component to entities so entities can be interacted with by players hitting the 'interact' ('e' by default) button.

Also added in a sample of a 'door' as an interactable item that can open or close when a player interacts with the object.

How Has This Been Tested?

Tested by verifying action works on local machine with entity debugger.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

Closes #160

[github-actions[bot]]

Test Coverage Results for editmode: Line Coverage: 91.4% Link to run results: https://github.com/nicholas-maltbie/PropHunt/actions/runs/464950354

[github-actions[bot]]

Test Coverage Results for editmode: Line Coverage: 100% Link to run results: https://github.com/nicholas-maltbie/PropHunt/actions/runs/465445943

[github-actions[bot]]

Test Coverage Results for editmode: Line Coverage: 100% Link to run results: https://github.com/nicholas-maltbie/PropHunt/actions/runs/465449604

[github-actions[bot]]

Test Coverage Results for editmode: Line Coverage: 100% Link to run results: https://github.com/nicholas-maltbie/PropHunt/actions/runs/466781660