Add 'Frame Rest' power saving option #15834
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Description
Experimental sleep feature aiming to lower CPU usage and temperature when using certain CPU hungry vsync modes. Specifically aimed for third party scanline sync, but since it seems to also work well enough with gl vsync, I decided to allow it to happen also while in menu and when internal vsync is enabled. Default is disabled of course.
The maximum sleep amount limit is half frame time, since going over that does not seem worth it. Many cores handle that easily with current hardware. There is no point using it with vulkan and other drivers with settings that won't drain the CPU.
I've been using and honing it for a month or so with decent results. In practice it lowers CPU temperature at best around 10c on average on my machine. No idea how well
retro_sleep()behaves with other platforms than Windows.Option added to both "Frame Throttle" and "Power Management" menus. Also cleaned some tabs.