[desktop] More qt_common reorganization (#3916)

Ported from QML branch.

Main "big" change is that EmuThread is now a shared state in QtCommon,
not individually managed/passed around by GRenderWindow and MainWindow.

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3916
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/core/file_sys/vfs/vfs.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -16,6 +19,12 @@
 #include "core/file_sys/fs_filesystem.h"
 #include "core/file_sys/vfs/vfs_types.h"
 
+#undef CreateFile
+#undef CopyFile
+#undef MoveFile
+#undef DeleteFile
+#undef CreateDirectory
+
 namespace FileSys {
 
 // An enumeration representing what can be at the end of a path in a VfsFilesystem