feat(client, server, shared): vittumainen bandage päälle, olkoot stna.

wip!(client, shared): re-enable browsing games, sota

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(shared): relocate types, add gamestate consts