[Part] Arc*: remove unneeded includes

- also sort includes

src/Mod/Part/App/ArcOfConicPyImp.cpp

@@ -20,20 +20,19 @@
  *                                                                         *
  ***************************************************************************/
 
-
 #include "PreCompiled.h"
 #ifndef _PreComp_
 # include <Geom_TrimmedCurve.hxx>
 #endif
 
-#include "Geometry.h"
-#include <Mod/Part/App/ArcOfConicPy.h>
-#include <Mod/Part/App/ArcOfConicPy.cpp>
-#include "OCCError.h"
-
 #include <Base/GeometryPyCXX.h>
 #include <Base/VectorPy.h>
 
+#include "ArcOfConicPy.h"
+#include "ArcOfConicPy.cpp"
+#include "OCCError.h"
+
+
 using namespace Part;
 
 // returns a string which represents the object e.g. when printed in python