Add slf4j
Remove old migrations and migrate to new db model

You'll need to manually reset your database before migrating
Update models to reflect migrations
Add ExecutionStack class for control callback stacks (#40) and migrate GUIs class to private model
Update StorageController for DB changes
Update GameController for DB changes
Remove old ship loading code
Migrate to ExecutionStack code
Add LoginResponse (lr), change Login to (lo), and remove old user/sandbox code so server will compile
Remove old main menu