WIP(sdbclient): better UI system

feat!(sdbclient): change to iyes_loopless states

chore(sdbclient): update deps, Cargo.toml format

feat!(sdbclient): handle new error format

feat(sdbclient): add states related to lobbies

fix(sdbclient): align loading screen text

chore(sdbclient): update deps

fix(sdbclient): remove lua things from playscreen

feat(sdbclient): lua ready to be used

Fix margins on account screen

Add logout

Fix API call for userinfop

Finish register/login, load configs on startup

Change CfgHidden to CfgDev

Move register/login to plugins, implement mostly

Print API check to console instead of stdout

Fix comment

Start of API mod and connection check plugin

Move menu to plugins mod

Create plugins mod, move splash to plugins