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Fix hi-res mode crashing + sync to upstream

OpenGL is the optimal display mode until Vulkan is in, and it's
mandatory on Wayland. Don't let it be disabled.

Sync to upstream

There's no point in disabling it at this point, so it's always supported.

libretro: Fix audio not being submitted when rendering is disabled

In commit 6628042f, audio upload was
moved from retro_run() to S9xDeinitUpdate(). This breaks audio when
runahead is enabled in RetroArch.

With second-instance runahead, S9xDeinitUpdate() is not called when
video rendering is disabled and thus the core instance responsible for
audio is not uploading the audio. With single-instance runahead, audio
is uploaded twice because video rendering is always enabled and thus
S9xDeinitUpdate() gets called twice per frame.

Fix this by introducing a callback that gets called at the end of every
screen refresh, regardless of whether or not rendering is active for
this frame. We can then decide in the callback whether or not audio
should be uploaded.

TODO: Fix Windows.

Uses std::filesystem and std::string.

Add controls for players 6-8

Remove extraneous code

Recognize when ports 1 and 2 are both set to multitap and add controls for players 6, 7, and 8. Compatible with homebrew game "N-Warp Daisakusen"

Small upstream sync

Make them more idiomatic C++.

Sync to upstream

This reverts commit 386bfe0a.