Use protobuf to save maps. That's what it's there for!
Convert all maps
Kill the old map loader and move loading code to Scenario.
Modify animations so they're tied to tile positions, not screen positions.
Make Animators::foo be entirely client-side. Animations are referenced by name now.
Move map serialization into gamestate. Players can pick any colour now.
Expunge the Scenario class.
Unify tile serialization.
Kick player button.
Break Server::Client into base client stuff & networked client stuff.
Always send OK/BADMOVE messages.

Worm OK messages are sent after the worm finishes.
Super dumb AI.