DNA copying challenge

[kostmo]

A challenge that utilizes a stack.
Closes #932.

Demo:

scripts/play.sh --scenario data/scenarios/Challenges/dna.yaml --autoplay

[xsebek]

@kostmo could you finish this using the let binding workaround suggested in #1032 (comment)?

This challenge looks really good and the workaround is only one extra let that we can remove once the issue is fixed.

[xsebek]

@kostmo, is this ready now that the bug has been fixed? 🙂

I think this was before rec, so the base might need a device for that.

[byorgey]

Love it!! My solution can be seen here: https://github.com/byorgey/swarm-defs/blob/main/dna.sw

I note only that it was slightly confusing that e.g. the siphon says it enables the drill command, but in fact one must say use "siphon" rather than drill. That's not something that can/should be solved in this PR but I thought it worth mentioning.

Once I had what I thought was sure to be a working solution, I enjoyed watching in horror as the mushrooms spread uncontrollably and ruined it, requiring me to switch the cloning order. 🍄 🍄 🍄 😁

Shall we close #932 when this is merged?