Changes:
CHEEVOS: Fix crash when scrolling Achievement List while Unofficial Achievements enabled (#6732).
CHEEVOS: Added hitcounts support for PauseIf/ResetIf (#6817).
COMMON: Automatically hide "Configuration Override options" in Quick Menu.
COMMON: Small Bugfix to not trigger savestate code when pressing Reset.
COMMON: Added libsixel video driver.
EMSCRIPTEN: Fix Game Focus Toggle.
HID/OSX: Fix to set hid device registration deterministic (#6497), to address issue #6640 re-adding dynamic device registration.
LOCALIZATION: Update Italian translation.
LOCALIZATION: Update Japanese translation.
LOCALIZATION: Update Polish translation.
LOCALIZATION: Update Portuguese / Brazilian translation.
LOCALIZATION: Update Russian translation.
LOCALIZATION: Update Spanish translation.
MIDI: Add MIDI support to the libretro API. Dosbox is the first proof of concept core implementing libretro MIDI.
MIDI: Add a Windows driver for MIDI, based on winmm.
MENU/QT/WIMP: Qt QSlider styling for Dark Theme.
MENU/QT/WIMP: Remove button ghostly inside highlighting.
MENU/QT/WIMP: Initial grid view.
MENU/QT/WIMP: Drag&drop to add new playlist items, add option to add/edit/delete playlists.
MENU/QT/WIMP: Add menu option to update RetroArch (Windows only for now).
MENU/QT/WIMP: Add menu option to manage shaders.
MENU/QT/WIMP: Add menu option to manage core options.
MENU/XMB: Add new icons for the settings
MENU/XMB: Add an option to show the desktop ui
METAL: Initial work-in-progress video driver for Metal. macOS-only right now, and currently requires macOS 10.13.
METAL: Supports XMB/MaterialUI, has a menu display driver. Has a font rendering driver.
METAL/SLANG: Slang shaders should be compatible with Metal video driver.
NETWORK: Enable SSL/TLS support by default for desktop platforms.
QNX: Fix Game Focus Toggle.
REMAPS: Fix the way offsets are calculated for keyboard remapping.
RUNAHEAD: Fix full-screen mode change breaking Secondary Core's environment variables.
VULKAN: Fix two validation errors.
VULKAN: Try to avoid creating swapchains redundantly. Should fix black screen and having to alt tab out of window again to get display working on Nvidia GPUs (Windows).
VULKAN/OSX: Initial MoltenVK support. Not enabled yet, several MoltenVK bugs should be fixed first before we can have it fully working.
X11: Fix Game Focus Toggle.
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