CMake: rework for Qt6 support

yuzu-cmd: Fix input callback crash on close

yuzu-cmd: Update configuration file description

FSR Sharpening Slider

crypto: use user-provided keys whenever possible

Solves an issue where autogenerated title keys would take precedence over those provided by user.

Replace GLSL as the default OpenGL shader backend

GLASM is not very compatible with the latest games, and too many people have the special superpower to break their Vulkan support.

video_core: Fine tune maxwell drawing trigger mechanism

maxwell_to_vk: Fix format usage bits and add R16_SINT

configure_graphics: Implement custom setting for FSR Sharpening

[audio_core] Fix an OoB with sample sinking

externals: always use LibreSSL on Windows

Qt: assign menuRole properties for actions

hle_ipc: Add helper function for determining element counts

YFC - Fermi2D: Rework blit engine and add a software blitter.

GPU: Fix buffer cache issue, engine upload not inlining memory in multiple lines, etc

GPU: Fix buffer cache issue, engine upload not inlining memory in multiline and pessismistic invalidation.

This PR rearranges things in the CMake system to make compiling with Qt6 possible

1. Camera API has changed in Qt6, so the camera feature is disabled
2. A previous fix involving QLocale is now version gated.
3. QRegExp replaced with QRegularExpression, see #5343
4. Qt6_LOCATION option added to specify a location to search for Qt6
  (see examples below)
5. windeployqt is used to copy Qt6 files into the build directory on Windows

Notes for Arch Linux
Arch install happened to have qt6-base qt6-declarative qt6-translations installed

mkdir build && cd build
cmake .. -GNinja -DYUZU_USE_BUNDLED_VCPKG=ON -DYUZU_TESTS=OFF -DENABLE_QT6=YES -DYUZU_USE_BUNDLED_QT=NO

Windows (MSVC)
Qt wants users to download precompiled libraries via an online installer,
it is worth noting that the GPL/LGPL takes precendence over any ...

In the Qt Maintenance tool, under a version, such as 6.3.1
Select "MSVC 2019 64-bit"
Under Additional Libraries Qt Multimedia may be of use for Camera support

For the Web Applet I had to select the following:
PDF Positioning WebChannel WebEngine

mkdir build && cd build
cmake -G "Visual Studio 16 2019" -DQt6_LOCATION=C:/Qt/6.4.0/msvc2019_64/ \
-DENABLE_COMPATIBILITY_LIST_DOWNLOAD=YES -DYUZU_USE_BUNDLED_QT=NO \
-DENABLE_QT_TRANSLATION=YES -DENABLE_QT6=YES ..

Some numbers for reference (msvc2019_64)
Qt5 (slimmed down) 508 MB
Qt5.15.2 all in    929 MB
Qt6.3.1           1.71 GB
Qt6.3.2           1.73 GB
Qt6.4.0-beta3     1.83 GB
Qt6.4.0           1.67 GB

This was somehow missed when the format was added to GL

- VK_FORMAT_B8G8R8A8_UNORM supports the STORAGE_IMAGE_BIT
- VK_FORMAT_R4G4B4A4_UNORM_PACK16 does not support the COLOR_ATTACHMENT_BIT

Will allow the compiler to complain about cases where ignoring the
return value would be a bug.

k_handle_table: Remove cast to void* in GetObjectForIpc