Add an unstacker.#250

The idea is to have something that splits the top stack from the rest of the stack.

This would be an end-game feature as it would allow interesting belt builds as you would be able to stack parts to get higher capacity and then unstack at the point that the parts are needed.

You can already use shape packages to get much higher capacities, so the unstacker doesn’t make sense for this.
However it could make sense to stack -> full paint -> unstack for example. So this is very interesting.

We added it and then we removed it again because it didn’t work well with the other mechanics

if I may add it is weird to have a simulated unstacker and not a real unstacker

The simulated unstacker is practically a requirement for MAMs, but a real one is not necessary for any purpose

I think an unstacker can still help with packing things tighter for transport. Also, I have one more idea - I would like to build a mechanical computer, i.e., use the shapes to represent data. For this to work, I need to be able to disassemble shapes to individual constituents. I can chop up a single layer with cutters, but without an unstacker, I won’t be able to use all the layers to encode data. I’m probably the only person in the world crazy enough to do something like this, but just wanted to let you know. X-D

packages?