feat(client, server, shared): new login/register

feat!(client, shared): move api calls to shared, dep shuffle,
and remove connection check stage

chore: update copyright notices

chore(client): rename sdbclient to client

WIP(sdbclient): create game UI and API call

feat!(sdbclient): handle new error format

Finish register/login, load configs on startup

APIError struct and login/register API calls

Start of API mod and connection check plugin