Add Skip Presenting Duplicate Frames Feature

[KojoZero]

This PR adds a toggle to the advanced graphics settings which allows the emulator to output at the original frame rate of the game/app, similar to how PCSX2 and Duckstation do it here. With this enabled, it allows frame generation tools to work more effectively on games that run below 60fps.

Closes #1772
Closes #367

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[KojoZero]

I'm KojoZero and the logo is from Azahar

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[SixelAlexiS90]

@KojoZero Hi! I have the latest Azahar build (2125.1.1) and this option isn't there, why? Thank you.

EDIT: ah ok, saw now that it's supposed to be released on 2126, is it possible to test it in the meantime?

[KojoZero]

@SixelAlexiS90 Sure. Here's a build of the pr. https://github.com/KojoZero/azahar/releases/tag/2125.1.1-spdf

[SixelAlexiS90]

@SixelAlexiS90 Sure. Here's a build of the pr. https://github.com/KojoZero/azahar/releases/tag/2125.1.1-spdf

Thank you a LOT!
I needed this since Azahar have a nasty VRR flickering issue on 30 FPS games when not using the "Skip Presenting Duplicate Frames" feature, this is due to a very erratic framepacing when "doubling" the framerate which makes the LFC behave incorrectly on various monitors (especially the one without Nvidia G-Sync Module).

This behavior is currently happening on PCSX2 as well and you can solve it with the same method and so by enabling "Skip Presenting Duplicate Frames"

I've explained it better here with my testings:
PCSX2/pcsx2#6647 (comment)

In the case of Azahar not even my 80 Hz trick solved the issue, the VRR flicker is very intense no matter what (it doesn't happen with native 60 FPS games btw).

I've only find two solutions in Azahar case for 30 FPS games:

• cap the framerate at 60 via an external cap like RTSS (async method)
• using this build with "Skip Presenting Duplicate Frames" enabled :'D

Thank you again <3