Add 'Test ECS Loop' to frontend

public/index.html

@@ -17,6 +17,7 @@
 		</div>
 		<canvas id="canvas" width="1000" height="600"></canvas>
 		<button onclick="untapAllZones()">Untap all</button>
+		<button onclick="ECSLoopTest()">Test ECS Loop</button>
 
 		<script src="/socket.io/socket.io.js"></script>
 		<script src="/shapes.js"></script>