this means that a mapper only needs to implement the Patch() if it makes
sense
mappers that don't need it have had the Patch function removed.
implemented function for SCABS and UA
corrected error messages for atari mappers - some messages weren't
referencing the correct atari mapper and simply stated "atari"
very few cartridge mappers need to return an error but is necessary in
the case of the experimental cartridge shim. merging here because it's a
good change to have
used by Activision's Robot Tank and Decathalon
updated method by which ParkerBros is fingerprinted. results are the
same but the code now matches other fingerprint methods
