Berconpy

- Adds three methods to AsyncRCONClient to get their respective protocol methods:
1. `is_running()`
2. `is_connected()`
3. `is_logged_in()`
- A few docstring corrections

Adds several new methods, events, an Arma extension, and major stability improvements.

**Full Changelog**: https://github.com/thegamecracks/berconpy/compare/v0.1.0...v0.2.0

Finishes implementation of `AsyncRCONClient.wait_for()`. Class structure and methods are planned to be stable, but the feature set is minimal.

None