Moler

* Unix commands - optional ctrl + z and kill on timeout - add `wait` call after `kill`
* Add helper for escape codes `[2004l` `[2004h`
* Add break_event to Event

* StateMachine - lock to avoid race conditions
* Command failure regular expression and exceptions for them
* Timeout msg for unix commands

* Optional log to console/stdout
* Optional sleep before commands in EventAwaiter
* Unix commands - optional ctrl + z and kill on timeout

* Refactoring - removed warnings for Python
* ConnectionObserverLifeStatus - debug enhancement
* Refactoring - fstrings

* Refactoring - Pylint
* Changed time calculation to time.monotonic()
* Type annotations for command base classes
* Removed code for Python < 3.7

* Common way to fail commands based on their output
* Start command(s) when event(s) finished - start_command_after_event
* Changed deprecated test code
* Removed support for Python 2.7-3.6