Validation of Address/Mask Painting

[travisgoodspeed]

All supported GatoROM decoders paint the bits of the table with addresses and masks. In theory, we could recreate the same byte array as the decoder returns by iterating over the bits and setting or clearing them in a fresh byte array of the right size.

There's no need to do that when the byte array is accurate, but making a test case for that would prevent regressions like #80. Close this issue when:

• The test is implemented.
• The test is run in all CLI gatorom decodings.