The optionals are unconditionally dereferenced when setting the custom
error text, and in a few cases this function is called using the default
value of the optionals.

This means we'd be dereferencing uninitialized storage.

Since they're used unconditionally, we can use value_or to set a default
when storage is uninitialized.

cmake: prefer system libraries

Vulkan: Implement Alpha coverage

service_thread: fix uninitialized memory usage

hle: service: audio: Use default service thread.

 Configuration: Add per-game input profiles 

vulkan_common: promote extension usages to core when possible

yuzu-cmd: link SDL2 correctly

externals: don't install xbyak as part of yuzu install

externals: update dynarmic, SDL2

Prevent yuzu from trying to install bundled xbyak as it'd likely
conflict with system xbyak package.

Error: Orphaned: include/xbyak/xbyak.h
Error: Orphaned: include/xbyak/xbyak_bin2hex.h
Error: Orphaned: include/xbyak/xbyak_mnemonic.h
Error: Orphaned: include/xbyak/xbyak_util.h
Error: Orphaned: lib/cmake/xbyak/xbyak-config-version.cmake
Error: Orphaned: lib/cmake/xbyak/xbyak-config.cmake
Error: Orphaned: lib/cmake/xbyak/xbyak-targets.cmake

video_core: add null backend

CMake: Use precompiled headers to improve compile times

general: fix compile for Apple Clang

video_core: Fine tuning the index drawing judgment logic

Vulkan: update initialization

shader_recompiler: add gl_Layer translation GS for older hardware

service: nifm: Update stubs for Submit/GetRequestState/GetResult

CMake: Fix FFmpeg find module

Explicitly use the bundled FFmpeg version, since we were auto-choosing
it before.

Uses find_package_handle_standard_args to handle the find_package call
from the root CMakeLists. Removes all the unnecessary logic after the
find_package and just sets it to REQUIRED.

Update translations (2022-12-01)