[FEM] Task*: remove unused includes

- also sort includes

src/Mod/Fem/Gui/TaskCreateNodeSet.cpp

@@ -20,39 +20,33 @@
  *                                                                         *
  ***************************************************************************/
 
-
 #include "PreCompiled.h"
 #ifndef _PreComp_
-# include <QString>
-# include <QSlider>
-
-# include <Standard_math.hxx>
-
-# include <Inventor/nodes/SoEventCallback.h>
-# include <Inventor/nodes/SoCamera.h>
 # include <Inventor/events/SoMouseButtonEvent.h>
+# include <Inventor/nodes/SoCamera.h>
+# include <Inventor/nodes/SoEventCallback.h>
 
 # include <SMESH_Mesh.hxx>
 # include <SMESHDS_Mesh.hxx>
-# include <SMDSAbs_ElementType.hxx>
+# include <Standard_math.hxx>
 #endif
 
-#include "ui_TaskCreateNodeSet.h"
-#include "TaskCreateNodeSet.h"
-#include <Gui/Application.h>
-#include <Gui/Document.h>
-#include <Gui/BitmapFactory.h>
-#include <Gui/ViewProvider.h>
-#include <Gui/WaitCursor.h>
 #include <Base/Console.h>
+#include <Gui/Application.h>
+#include <Gui/BitmapFactory.h>
+#include <Gui/Document.h>
+#include <Gui/Utilities.h>
 #include <Gui/View3DInventor.h>
 #include <Gui/View3DInventorViewer.h>
-#include <Gui/Utilities.h>
-
+#include <Gui/ViewProvider.h>
+#include <Gui/WaitCursor.h>
 #include <Mod/Fem/App/FemMeshObject.h>
 #include <Mod/Fem/App/FemSetNodesObject.h>
-#include "ViewProviderFemMesh.h"
+
+#include "TaskCreateNodeSet.h"
+#include "ui_TaskCreateNodeSet.h"
 #include "FemSelectionGate.h"
+#include "ViewProviderFemMesh.h"
 
 
 using namespace FemGui;