Correctly handle receivers like the c534:
Support devices that only allow a limited number of total re-pairings Support devices that do not unpair or when pairing replace existing pairings Add information about max_pairings, unpairing, and re-pairing to the list of receivers by USB id Set up c534 as receiver with max 2 pairings, no unpairing, re-pairing
It may be that all nano receivers work the same way as the c534. This PR only sets up the c534, as that is the only nano receiver I have access to. Changing all nano receivers to work this way is simply a matter of changing _nano_receiver in base_usb.py
This updates PR #614