V7.4: 05-June-2022 by wavemotion-dave
- Added back DrZ80 core and fixed Colecovision Boulder Dash so it doesn't crash.
- Better Einstein CTC handling so timing is a bit more accurate.
- Improved Einstein memory swap for faster performance.
- Improved MSX mapper detection - about 30 more games playable without fiddling with settings.
- MSX PAL game support added (it was only 80% working before this).
- A few more frames of performance squeezed out to make more games run buttery-smooth.
V7.4a - Hotfix for SAVE/LOAD.