feat!(client, server, api, shared): revamp data requests!
 * now even more generic than before
 * also implemented GET game/{id}
 * GET game/all_forming and game/my_games now return only ids
 * client now has a way to cache basic information about all games
   fetched in the play screen, reducing the amount of data transferred

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): reimpl all_games and my_games

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