V3.1 : 08-May-2023 by wavemotion-dave
- Added CAR and ROM support for the more popular cartridge types up to 1MB.
- Added new D-Pad options to support joystick 2 (for games like Wizard of Wor) and diagonals (Q-Bert like games).
- Improved keyboard handling so CTRL key is now sticky.
- Improved menu transitions to reduce audio 'pops' as much as possible.
- Auto-rename of XEGS-DS.DAT to A8DS.DAT to match new branding.
- Squeezed as much into fast ITCM_CODE as possible with almost no bytes left to spare.
- Other cleanups and minor bug fixes as time allowed.