feat(sdbclient): add states related to lobbies

feat(sdbclient): lua ready to be used

Add logout

Finish register/login, load configs on startup

Move register/login to plugins, implement mostly

Move menu to plugins mod

Move Cfg things to a new mod

Move user cfgs to CfgUser

Register UI, input naming changes

Unused muts

Naming changes

Basic menu layout, missing functionality still