split up game code using new es5 syntax or whatever

common/game_basic.js

@@ -0,0 +1,24 @@
+class GameBasic {
+    constructor() {
+        let player = new Player(true);
+        let entities = [player];
+
+        for (let i = 0; i < 50; i++) {
+            entities.push(new Player())
+        }
+
+        this.player = player;
+        this.entities = entities;
+    }
+    main() {
+        let { entities } = this;
+
+        for (let ent of entities) {
+            ent.handleTick(this);
+        }
+    }
+    init() {
+        let that = this;
+        setInterval(function () { that.main() }, 1000 / 60);
+    }
+}