Richo/hotplug events #42
                
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Hi! I finally got something working as far as libusb callbacks go. This PR is a mess, I mostly wanted to run the API past you before I clean things up and unify (I created some aspirational modules while I was noodling and obviously it's not great to have a module with one enum in it).
I'll add some comments for the parts I'd like you to look at. Thanks!