Max width and height for `resizeCanvasToDisplaySize`

[evoactivity]

I'm using twgl to create backgrounds for pages, on very large displays this can cause the canvas to become huge, tanking performance.

I've patched the project locally to introduce maxWidth and maxHeight arguments for the resizeCanvasToDisplaySize and let CSS stretch the canvas the rest of the way should the display size be large.

function resizeCanvasToDisplaySize(canvas, multiplier, maxWidth, maxHeight) {
  multiplier = multiplier || 1;
  multiplier = Math.max(0, multiplier);
  var width = Math.min(canvas.clientWidth * multiplier | 0, maxWidth);
  var height = Math.min(canvas.clientHeight * multiplier | 0, maxHeight);
  if (canvas.width !== width || canvas.height !== height) {
    canvas.width = width;
    canvas.height = height;
    return true;
  }
  return false;
}