Major rework of basic game code - pre-work for multiplayer

Includes automatic generation of required HTML elements and better responsiveness

js/helper-functions.js

@@ -0,0 +1,6 @@
+HTMLCanvasElement.prototype.adjustResolution = function (ctx, scale) {
+    this.width = this.clientWidth;
+    this.height = this.clientHeight;
+
+    ctx.scale(scale, scale);
+};