[Spread] remove unused includes

- also sort includes
- also additions to precompiled header

src/Mod/Spreadsheet/App/PropertyRowHeightsPyImp.cpp

@@ -20,15 +20,14 @@
  *                                                                         *
  ***************************************************************************/
 
-
 #include "PreCompiled.h"
 
 #include "PropertyRowHeights.h"
-
 // inclusion of the generated files (generated out of PropertyRowHeightsPy.xml)
 #include "PropertyRowHeightsPy.h"
 #include "PropertyRowHeightsPy.cpp"
 
+
 using namespace Spreadsheet;
 
 // returns a string which represents the object e.g. when printed in python