Replace the core option envs. Closes #12.
Turn this into a function.
Fill in this one properly. Move the comment because it's getting bulky.
Split this string. Closes #15.
Add bankswitch to the cheat descriptors. Some old cheat devices support 'change address 0x1234 to 0x56, but only if it is currently 0x78'; with this flag, we can convert those to our format.
Remove the old cheat interface, for reasons mentioned in #9. Closes #9.
I chose to keep MESSAGE and SHUTDOWN; while I still don't understand them, I'll assume others do.
Move the deleted envs together.
Actually, screw that, we have the v1 header and the git history. What do we need those for?
Put the envs' data structures near their definitions so people reading this header won't need to jump back and forth.