Make the game-of-life example a bit more interesting

This moves the entire image buffer to WASM that now also applies some fading.

examples/mandelbrot/index.html

@@ -17,7 +17,7 @@ canvas { position: absolute; top: 60px; left: 20px; width: calc(100% - 40px); he
   ( <a href="https://github.com/AssemblyScript/assemblyscript/blob/master/examples/mandelbrot/assembly/index.ts">source</a> )
 </h1>
 <canvas></canvas>
-<script>
+<script>"use strict";
 
 // Set up a 2D rendering context
 var cnv = document.getElementsByTagName("canvas")[0];