[TD]clazy warnings and duplicate setter/getter

- clazy warning re missing Q_OBJECT

- include TechDrawGlobal.h in headers

- resolve duplicate setter/getters

src/Mod/TechDraw/App/DrawViewImage.h

@@ -39,7 +39,8 @@ namespace TechDraw
 class TechDrawExport DrawViewImage : public TechDraw::DrawView
 {
     PROPERTY_HEADER_WITH_OVERRIDE(TechDraw::DrawViewImage);
-
+    Q_OBJECT
+
 public:
     /// Constructor
     DrawViewImage();