Unvarying interrupt configuration moved from StartISO15693Demod to CodecInit
Fixed an old issue (https://github.com/geo-rg/ChameleonMini/issues/4) properly
overwriting the PERBUF register when no data has to be sent
Loadmodulation ISR has a new GOTO label which is called when ISO t1 time is
elapsed, but data is not yet ready. This way it is possible to avoid checking
for state validity on every ISR hit
New inline function to clean up interrupts when field noise (garbage)
is incorrectly picked up
Bitrate configuration in ISO15693_EOC has been simplified
Cleaned up header file with useless defines. Moved defines to .c when there was
no need to share them with other source files
Annotated numer of clock cycles consumed by asm ISR sharing routine
As usual, this work was done with @MrModDom