V5.4: 07-Jan-2022 by wavemotion-dave
- AY Envelope sound handler improved - more games sound right!
- MSX, SG-1000 and Sord M5 SAVE/LOAD states working.
- Press X on ROM selection to force-load MSX game cart (in case auto-detect fails).
- Faster audio processing to gain us almost 5% speed boost across the board.
- Fix controls when launched from TWL++
- More cleanups and minor improvements under the hood.