add forward declare for xml

Signed-off-by: Michael Pollind <[email protected]>

Code/Editor/QtViewPaneManager.cpp

@@ -44,6 +44,7 @@
 #include <AzQtComponents/Utilities/QtViewPaneEffects.h>
 #include <AzQtComponents/Components/StyleManager.h>
 #include <AzCore/UserSettings/UserSettingsComponent.h>
+#include <IXml.h>
 
 // Helper for EditorComponentModeNotifications to be used
 // as a member instead of inheriting from EBus directly.

Code/Editor/QtViewPaneManager.h

@@ -35,6 +35,7 @@ class QMainWindow;
 class ViewportEditorModeNotificationsBusImpl;
 struct ViewLayoutState;
 struct QtViewPane;
+class XmlNodeRef;
 
 namespace AzQtComponents
 {