Vanilla server compatibility

[ugudango]

I have found this mod port to be incredibly useful and well-implemented.

There's one little aspect, however, that could make this project even more useful - support for filling with commands. Litematica implements this.

This way, the mod could run on vanilla servers.

If the original forge mod has no support for this, however, one could argue that this is out of the scope of this port.

Although I'm a bit rusty with mod-making, I could try to come up with a PR. But first let's see if there's anything to this suggestion.