[desktop] port IR Camera to Qt6 & fix camera saving on windows (#3630)

The camera was previously saved without escaping the name which made the values unusable after a settings load, for whatever reason replacing the backslashes when saving with / doesn't work but replacing them with | does.

Also note that the OBS virtual cam (and any other cameras that only have directshow drivers) won't work because Qt6 dropped support for that and the ffmpeg backend doesn't seem to support it either.

Closes #3468

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3630
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: DraVee <dravee@eden-emu.dev>
Co-authored-by: smiRaphi <neogt404@gmail.com>
Co-committed-by: smiRaphi <neogt404@gmail.com>

src/yuzu/bootmanager.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: 2014 Citra Emulator Project
@@ -34,7 +34,8 @@
 
 class MainWindow;
 class QCamera;
-class QCameraImageCapture;
+class QImageCapture;
+class QMediaCaptureSession;
 class QCloseEvent;
 class QFocusEvent;
 class QKeyEvent;
@@ -264,12 +265,13 @@ private:
     bool first_frame = false;
     InputCommon::TasInput::TasState last_tas_state;
 
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0)) && YUZU_USE_QT_MULTIMEDIA
+#if YUZU_USE_QT_MULTIMEDIA
     bool is_virtual_camera;
     int pending_camera_snapshots;
     std::vector<u32> camera_data;
     std::unique_ptr<QCamera> camera;
-    std::unique_ptr<QCameraImageCapture> camera_capture;
+    std::unique_ptr<QImageCapture> camera_capture;
+    std::unique_ptr<QMediaCaptureSession> capture_session;
     std::unique_ptr<QTimer> camera_timer;
 #endif