Mesen-YY v4

Included MesenCE's changes (minus a few thing, such as updater related thing).
Lowered audio latency caution to less than 50ms.
Revert video aspect ratio's default option back to no stretching.
Changed memory search's default options, value default use unsigned, and default compare to previous search value.
Forgot to update history viewer's scale size, now updated to 12x.
NES: Slightly lowered VRC6 mixing volume.
NES: Improved default palette's $3x row brightness, and added more palette presets.
SMS: Revert master volume back to original.
WS: Revert Nexen's changes back to original, except turbospeed config.