Rewrite to use class

[KonSola5]

This PR:

• Rewrites the entire class to use, well, class instead of setting the prototype of the function,
• Changes square bracket notation to dot notation (for example: emote["n"] => emote.n)
• Removes needlessly used template literals: `${number}` => number,
• Removes let self = this and rewrote some local functions to be arrow functions instead. Arrow functions don't generate this binding, so this will point to the class instance.
• Removes usage of element.innerHTML = "" to clear out elements - replaced with element.replaceChildren().