Snes9x EX+

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* Update core to Snes9x GIT d30060c (2023.11.03)
* Add state rewind support, configure by setting rewind states in Options->System and binding the rewind action to virtual/physical controls
* When moving virtual controls, add option to snap to pixel grid (2 to 64 pixels)
* Remember scroll position when going up a folder
* Add key bindings for system reset
* Various tweaks and fixes for physical gamepad mappings