Implemented trapped chests & others

+ Added trapped chests
* Fixed a bunch of bugs in the redstone simulator concerning wires and
repeaters
* Other potential bugfixes

With thanks.
No, but it makes any non-standard characters username kinda visible. If the username ended in a space, wecould spend quite a lot of time hunting down problems and being unable to reproduce at first because no-one would know that there's an extra space.

I agree that it's unlikely to happen with usernames. There are other strings where this makes sense, however.