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.