feat(api): get /api/user for public user details

feat(schema, shared, api): move all types to shared, separate schema
 * schema is now stored in a separate crate to avoid dependency cycles
 * added note in README.md about handling unwraps

feat(api): stubs for most game endpoints, complete create

feat(api): increase session lifetime to 30 days

feat(api): logout endpoint

feat(api): session validation

WIP(api): session management

fix(api): /ping -> /api/ping

feat(api): init redis session backend

feat(api): reimpl user registration

feat(api): user model

feat(api): reimpl /api/info

feat(api): embed migrations

feat(api): database connection

feat(api): init new api

chore: update licenses

feat: add shared, server, api