Pybfbc2stats

This release adds support for retrieving server list and individual server's details via the theater backend.

**Please note:** The release contains a number of breaking changes. Be sure to update your application accordingly.

Other changes/fixes:
- former `Client` is now referenced as`FeslClient` and `AsyncClient` is now `AsyncFeslClient`
- former `Connection` is now referenced as `SecureConnection`, `AsyncConnection` is now `AsyncSecureConnection`
- renamed `PyBfbc2StatsLoginError` exception to `PyBfbc2StatsAuthError`
- added fesl client method to retrieve theater backend details
- fixed hello request paket being stored as response in async fesl client

This release brings a lot of stability improvements and adds a method to extract the FESL session lkey.

Other changes/fixes:
- increased default client timeout to 3 seconds
- enforce a minimum client timeout of 2 seconds
- fixed `search_name` signature mismatch between Client and AsyncClient
- changed how read loops are timed out to avoid timing out while receiving packet data
- only send logout packet if Client is logged in
- internally handle packets as objects

This release addresses a rare issue with the client infinitely trying to read a packet header/body.

This release adds handling for socket exceptions when reading a response packet header.

This release adds support for cross-namespace persona name search.

Other changes/fixes:
- Added cem_ea_id to available namespaces
- Added missing exceptions to \_\_all__ package export
- Fixed search error exception class not following naming scheme

This release adds a specific exception for connection errors and adds missing stats keys for the GOL Magnum Sniper.