API: Add ability to track all event listeners throughout the menu

[NickDJM]

Summary

Need to add wrapper methods around addEventListener and removeEventListner so we can track everything and dispose of all elements if the user requests it.

We'll add _addEventListener(), _removeEventListner(), and _removeEventListeners() as protected methods which can be used to add/remove listeners from a new _listeners array.

Additional context

See #471 for reasoning