* add separate timeout for tag response to nr_ar
* measure response time and use it for response timeout
* don't drop field between keyblocks
* some reformatting
* some whitespace fixes
* add detection of static tag nonces
* add tag nonce to error message
* modify mfCheckKeys() to pass button press events upstream
* don't abort nested when a static nonce is encountered
* modify nested to try multiple keys in a single operation
* Print keys remaining only every 10 seconds, and add estimated worst-case time