Quirks mode

[jenningsfan]

Add toggleable quirks with pre-set defaults

[jenningsfan]

• [X] vF reset - 8XY1-3 reset the vF flag on the original Cosmac VIP interpreter
• [X] shifting - 8XY6 and E operate on vX or vY on different platforms
• [X] reg load decode - FX55 and FX65 increment I on some platforms but not others
• [X] jump - BNNN is changed to BXNN on some platforms
• [ ] wrap around quirk - some platforms sprites wrap around screen
• [ ] vblank - not sure this is possible to toggle in this interpreter - low priority

[jenningsfan]

https://github.com/chip-8/chip-8-database/blob/master/database/quirks.json

[jenningsfan]

https://github.com/Timendus/chip8-test-suite#quirks-test

[jenningsfan]

Links to these: #6 #5. Some of the quirks are different in each