Convert attack pool symbol labels and colors to enums

[danbuis]

Requirements

I don't trust text long term. Switch to enums so that we don't have to worry about typos or weird capitalization issue.

Potential Solutions

If you have some ideas, toss them in here. They do not need to be fleshed out or even correct.

Potential Tasks

What does it take to call this issue complete?

• [ ] Write new unit tests
• [ ] Pass all unit tests
• [ ] DefDone: How can this be considered done?
• [ ] Other?

[danbuis]

Implemented as part of first attackpool pass