[FEM] FemPost*: remove unused includes

- also sort includes

src/Mod/Fem/App/PropertyPostDataObject.cpp

@@ -23,37 +23,33 @@
 #include "PreCompiled.h"
 
 #ifndef _PreComp_
-# include <Python.h>
-# include <vtkPolyData.h>
-# include <vtkStructuredGrid.h>
-# include <vtkRectilinearGrid.h>
-# include <vtkUnstructuredGrid.h>
-# include <vtkUniformGrid.h>
 # include <vtkCompositeDataSet.h>
 # include <vtkMultiBlockDataSet.h>
 # include <vtkMultiPieceDataSet.h>
+# include <vtkPolyData.h>
+# include <vtkRectilinearGrid.h>
+# include <vtkStructuredGrid.h>
+# include <vtkUnstructuredGrid.h>
+# include <vtkUniformGrid.h>
 # include <vtkXMLDataSetWriter.h>
+# include <vtkXMLImageDataReader.h>
 # include <vtkXMLPolyDataReader.h>
+# include <vtkXMLRectilinearGridReader.h>
 # include <vtkXMLStructuredGridReader.h>
 # include <vtkXMLUnstructuredGridReader.h>
-# include <vtkXMLRectilinearGridReader.h>
-# include <vtkXMLImageDataReader.h>
 #endif
 
-#include <Base/FileInfo.h>
+#include <App/Application.h>
+#include <App/DocumentObject.h>
 #include <Base/Console.h>
+#include <Base/FileInfo.h>
 #include <Base/Reader.h>
 #include <Base/Stream.h>
 #include <Base/Writer.h>
-#include <App/Application.h>
-#include <App/DocumentObject.h>
 #include <CXX/Objects.hxx>
 
 #include "PropertyPostDataObject.h"
 
-#ifndef _PreComp_
-
-#endif
 
 using namespace Fem;