[hecs-plugin-three] Be able to set WebGLRenderer constructor params

Currently, there is no way to configure the renderer created in Presentation:

```
  createRenderer() {
    const renderer = new THREE.WebGLRenderer({
      antialias: true,
    })
...
```

As far as I can tell, these constructor params cannot be set after-the-fact.

**Use Case:** In order to get mixed-mode CSS3D+WebGL working, I need the `alpha: true` setting for WebGLRenderer.