add callable stop flag to event listener

[pedrofurrix]

Add stop flag to EventListener for graceful shutdown of event loop.

[jsiegle]

Hi @pedrofurrix thanks for this PR! Can you provide an example of how you're actually using this in your experiments?

[pedrofurrix]

Hey Josh, yes.
I have prepared a simple script where I illustrate how I usually use it together with the OpenEphysHTTPServer!
stop_event_listener.py

[jsiegle]

Thanks! These changes are now available in open-ephys-python-tools v1.0.1

[pedrofurrix]

Great, appreciate it!