[TD] remove unused headers (#8155)

* [TD] remove unused headers

- also some sorting
- also improve readability by not using an abbreviation (we consistently don't abbreviate class names)

src/Mod/TechDraw/App/DrawViewDimension.h

@@ -25,21 +25,17 @@
 
 #include <tuple>
 
-#include <gp_Ax3.hxx>
-
 #include <App/DocumentObject.h>
 #include <Base/UnitsApi.h>
 #include <Mod/TechDraw/TechDrawGlobal.h>
 
-#include "DrawViewPart.h"
 #include "DimensionGeometry.h"
 #include "DimensionReferences.h"
-
-#include "Geometry.h"
-#include "DrawView.h"
 #include "DrawUtil.h"
+#include "DrawView.h"
+#include "DrawViewPart.h"
+
 
-using DU = TechDraw::DrawUtil;
 class TopoDS_Shape;
 
 namespace Measure {