* digital_signal: optimize calculationxx * firmware: add listen start and listen rx * digital signal: rework with fixed point calculation * nfc: tune timings * nfc: fix array overflow * mifare classic: fix key access * nfc: rework spi bus access * nfc: rework listen mode with st25r3916 calls * digital signal: speed up digital_signal_append() * digital signal: remove unused profiling * nfc: clean up code * nfc: correct sleep state * nfc: add unit tests * nfc: fix memory leak in unit test * digital_signal: remove unused code * nfc: fix incorrect sak load in pt memory Co-authored-by: あく <alleteam@gmail.com>