fix(api): check if user exists before hashing password on registration

feat(api): reimpl user registration

fix(api): skip user model password field

fix(api): NewUser -> InsertableUser

feat(api): user model

feat(api): reimpl /api/info

feat(api): embed migrations

feat(api): database connection

fix(api): timestamp -> timestamptz

feat(api): migration create_games

feat(api): migration create_actions

feat(api): migration create_gamedata

feat(api): migration create_users

feat(api): init diesel and db

feat(api): init new api

chore: update licenses

feat: add shared, server, api