Snes9x EX+

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* Add support for multiple memory patch codes per entry
* Improve emulation thread timing accuracy, please report any performance regressions
* Add Frame Timing -> Output Rate option to control the frame rate when using the Screen frame clock
* Prefer the highest screen frame rate when the screen/output rates don't divide evenly
* Add option to display various frame timing stats during emulation
* Only show supported frame clocks in options and clarify descriptions