Pysteamauth

- Removed support python 3.7 and python 3.8
- Use strict versions of dependencies
- Bump versions of dependencies

- `get_steam_guard` method is classmethod now
- Removed docstrings
- Added new properties to Steam class
- Removed `AuthenticatorData` schema
- Removed `SteamAuthorizationStatus` schema
- Removed `ServerTimeResponse` schema
- Removed `get_host_from_url` function
- Initialize `steamid` if it doesn't specify
- Steam class now accepts objects of `BaseRequestStrategy` and `BaseCookieStorage`

- Removed default value for `domain` parameter in cookie storage

- Removed useless exceptions

- Fixed `check_http_status` method

- Updated protobuf version