Applied Holiman's fixes for iclass.c and CSNs

Applied PwPiwi's new parity fix.
Applied Marshmellw's fixes for FSKdemod (HID, IO)

FIX: a potential bigbuffer fault given pwpiwi's change inside lfops.c CmdIOdemodFSK & CmdHIDdemodFSK
FIX: change some "int" parameters to uint's.
FIX: changed the lfops.c -  DoAcquisition125k_internal  to respect pwpiwi's definitions of FREE_BUFFER_OFFSET

HEADS up:  The ultralight functions hasn't been verified since pwpiwi's changes.

client/cmdmain.c

@@ -198,10 +198,9 @@ void UsbCommandReceived(UsbCommand *UC)
   switch(UC->cmd) {
       // First check if we are handling a debug message
     case CMD_DEBUG_PRINT_STRING: {
-      char s[USB_CMD_DATA_SIZE+1];
+      char s[USB_CMD_DATA_SIZE+1] = {0x00};
       size_t len = MIN(UC->arg[0],USB_CMD_DATA_SIZE);
       memcpy(s,UC->d.asBytes,len);
-      s[len] = 0x00;
       PrintAndLog("#db# %s       ", s);
       return;
     } break;