When screen is wider than 800px render width is caped at 800 px

https://github.com/s-macke/VoxelSpace/blob/60d7ae12f232f940805afafd5720fa908c173833/VoxelSpace.html#L497

Expected code may be:
```
screendata.canvas.width = window.innerWidth<800?800:window.innerWidth;
```

Why the 800px hard limit?