core,common,yuzu qt: Add CPU accuracy option 'Auto'

yuzu qt: config: Only save renderer_debug as a global setting

This is a bug fix. Enabling graphics debug mode, then saving a custom
configuration causes graphics debugging to be saved and read from the
custom configuration.

Isolate it the same way we isolate the CPU settings.

common: Add stateful thread worker and unique function utilities

Decouples the CPU debugging mode from the enumeration to its own
boolean. After this, it moves the CPU Debugging tab over to a sub tab
underneath the Debug tab in the configuration UI.

Old CPU Accuracy setting won't translate well into since we're adding
one at the beginning of the list. On first boot with the new setting,
just use the default setting.

Now sets optimizations regardless of the Settings. Drops unsafe fastmem
optimization.

The current CPU accuracy settings in yuzu are fairly polarized and
require more than common knowledge to know what the optimal settings for
yuzu would be. This adds a curated option called 'Auto' that applies a
few at the moment known-good unsafe optimizations to Dynarmic.

general: Move most settings' defaults and labels into their definition

Slight improvements to readability.

Dropped suggestions for string_view (settings.h:101), pass by value
(settings.h:82), reverting double to a float (config.cpp:316), and other
smaller ones, some out of scope.

Addresses review feedback.

Co-authored-by: Ameer J <52414509+ameerj@users.noreply.github.com>

* Fix out of bound blit error

* Fix code read

* Fix ci error

Co-authored-by: Feng Chen <chen.feng@gloritysolutions.com>

Support more PCM formats

audio_core: Preserve front channel volume after 6 to 2 downmix

Many games report 6 channel output while only providing data for 2. We only output 2-channel audio regardless, and in the downmixing, front left/right only provide 36% of their volume. This is done assuming all of the other channels also contain valid data, but in many games they don't. This PR alters the downmixing to preserve front left/right, so volume is not lost.

This improves volume in Link's Awakening, New Super Mario Bros U, Disgaea 6, Super Kirby Clash.

[audren] Report 2 channels active rather than 1

util_shaders: Fix BindImageTexture

According to
https://gitlab.freedesktop.org/mesa/mesa/-/issues/3820#note_753371 we
need to set these to true for use with 3D textures.

Fixes BOTW teleporting on RadeonSI and iris.

common: fs: More misc. changes

GPU Memory Manager - Correct handling of non continuous backing memory.

CMakeLists: Treat -Wsign-compare as an error on GCC/Clang