ControllerInterface: Implement ChangeWindow on DInput without recreating the devices

Also polished DInput code in general to try and mitigate issue 11702.
Added a lot of logging and comments.

Source/Core/InputCommon/ControllerInterface/Win32/Win32.h

@@ -8,5 +8,6 @@ namespace ciface::Win32
 {
 void Init(void* hwnd);
 void PopulateDevices(void* hwnd);
+void ChangeWindow(void* hwnd);
 void DeInit();
 }  // namespace ciface::Win32