Main

- MGL: support up to 6 actions, reset action and other improvements and fixes.

- Support setting sync polarity and override configuration based on video mode  (Thomas Sowell).

- IDE/floppy fixes for x86 (Alex Oughton).

- added help menu (alanswx).

- input: Guncon support via RetroZord adapter (Matheus Fraguas)

- input: GunCon 3 tweaks (Nolan Nicholson).

- input: add support for rumble (zakk4223).

- ao486: MiSTerFS fixes/tweaks (p2mate, user7182).

- Other fixes and tweaks.

Note: you must update MiSTerFS.exe in ao486 as well!