Add cotton, strings, and nets

[byorgey]

• Add a cotton entity that grows in some of the places there used to be flowers
• 4 cotton make one string, with a small motor catalyst. Currently, string serves no purpose except being an ingredient for net, but I imagine we can find other fun things to do with strings.
• 256 string make one net.
• A net is a device that enables the try command.

This is intentionally a bit on the harder side to construct. You need to set up some good automation to be able to crank out the nets if you want to be able to use try on your robots.

Closes #132.

[xsebek]

LGTM!

Maybe we could tie it to the string type. Otherwise it might be good to rename it to text.

[byorgey]

Hmm, what if string is a device that allows format and ++? Right now a logger is required to use those.

Maybe renaming the string type to text is a good idea anyway; the name string is a historical accident tied to a specific representation of text. Then the fact that a string is the device for doing stuff with text would itself be a kind of joke.

[xsebek]

😉