v4.0.0

• parse replay_id for replays
• add scorev2 and mirror mods
• mod_combination is now an IntFlag instead of a list of enums
• add support for parsing "pure" lzma strings
  • this is useful for replays retrieved from the api, since the api only gives us the lzma replay data and nothing else, unlike osr files
• remove the last frame, which contains the "rng seed", after a certain osu! version
• add type annotations to public-facing members
• rename GameMode members for consistency
• implement __str__, __eq__, __hash__ for ReplayEvent
• replace raising Exception with raising ValueError instead