appveyor: Remove completely broken integration, thanks vcpkg

Qt: Fix Qt 5 build

Qt: Replace save warning with a copy dialog (closes #3637)

Qt: Pull new core path out of CoreController instead of passing directly

Qt: Add gamepad-specific info to the report view

Qt: Make Gamepad::current* const

Clean up some warnings

Core: Fall back to saving non-PNG state if getting pixels fails

GBA Video: Fix crash when saving/loading state without renderer (fixes #3751)

Qt: Clean up SDLInputDriver::updateGamepads logic

SDL: Fix controllers getting duplicated

Wii: Add screen modes optimizing for a 4:3 or 16:9 display (closes #2860)

Qt: Add missing ARM64 AppImage update option

Qt: Fix updating AppImage on Linux (fixes #3742)

Qt: Fix controllers freezing due to re-entrancy issues on Windows