Snes9x EX

What's New:

- Fix issue where sound stops working after it's muted during fast/slow mode
- Add "Target Frame Rate" option for running emulation at a lower frame rate to save power or if the device can't deliver a stable full rate
- Moved "Skip Late Frames" option into "Target Frame Rate" menu as "Full (No Skip)"
- Remove unneeded "Reduce Compositor Lag" option, its function is now managed automatically