ImportSongs: Add plugin support

- Files with filenames that end with .taikoweb.js can be imported and run to add custom functionality to the game
- The plugin file is a javascript module script that should have a class in the default export
- Currently supported methods in the class: name (string), load, start, stop, unload (functions)
- The class can be extended from the Patch class to add automatic patching of variables and functions
- Here are some of the plugins I made: https://github.com/KatieFrogs/taiko-web-plugins

public/src/js/debug.js

@@ -1,5 +1,8 @@
 class Debug{
-	constructor(){
+	constructor(...args){
+		this.init(...args)
+	}
+	init(){
 		if(!assets.pages["debug"]){
 			return
 		}
@@ -329,7 +332,10 @@ class Debug{
 	}
 }
 class InputSlider{
-	constructor(sliderDiv, min, max, fixedPoint){
+	constructor(...args){
+		this.init(...args)
+	}
+	init(sliderDiv, min, max, fixedPoint){
 		this.fixedPoint = fixedPoint
 		this.mul = Math.pow(10, fixedPoint)
 		this.min = min * this.mul