Add support for upcoming TappyUSB readers, and detecting tag entry and exit events using AutoPollCommands. Added URL record support for keyboard mode

This release adds support for TappyUSB readers that use the vendor-specific USB device class.

Also added is a new AutoPollCommand that allows detecting and notifying the host of tag entry and exit events.

Update 22-April-2022: The Tappy Demoexecutable (zip archive) was updated in this release to v3.3 to include keyboard entry support for URL/URI records read from NFC tags.

Update 29-July-2022: Added minor updates to the demo program to indicate that it's best to unplug other serial USB COM port devices if you're having trouble autodetecting the TappyUSB.