MERGED: @holimans changes

MERGED: @piwi changes
MERGED: @marshmellows changes.

I'm not even gonna try write up all that stuff..

ADD: changed some commands inside the "Hf 14a sim" on deviceside.
ADD: @mobeius "two nonce" version for mfkey32.   It is also inside the "hf 14a sim" with the "x" parameter.

armsrc/lfops.c

@@ -402,7 +402,7 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol)
 	for(;;) {
 		//wait until SSC_CLK goes HIGH
 		while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)) {
-			if(BUTTON_PRESS() || usb_poll()) {
+			if(BUTTON_PRESS() || (usb_poll_validate_length() )) {
 				DbpString("Stopped");
 				return;
 			}