[TD] Gui, A*-C*: remove unused includes

- also sort includes
- also an addition to precompiled header
- TaskCenterLine: remove unused code that interferes with used code with the same name

src/Mod/TechDraw/Gui/CommandStack.cpp

@@ -18,14 +18,14 @@
  *                                                                         *
  ***************************************************************************/
 
-
 #include "PreCompiled.h"
 
-#include <QApplication>
-#include <QMessageBox>
+#ifndef _PreComp_
+# include <QApplication>
+# include <QMessageBox>
+#endif
 
-#include <App/Application.h>
-#include <App/Document.h>
+#include <App/DocumentObject.h>
 #include <Base/Console.h>
 #include <Gui/Action.h>
 #include <Gui/Application.h>
@@ -36,7 +36,6 @@
 #include <Gui/MainWindow.h>
 #include <Gui/Selection.h>
 #include <Gui/ViewProvider.h>
-
 #include <Mod/TechDraw/App/DrawPage.h>
 #include <Mod/TechDraw/App/DrawView.h>
 
@@ -46,14 +45,12 @@
 
 using namespace TechDrawGui;
 using namespace TechDraw;
-using namespace std;
 
 void execStackTop(Gui::Command* cmd);
 void execStackBottom(Gui::Command* cmd);
 void execStackUp(Gui::Command* cmd);
 void execStackDown(Gui::Command* cmd);
 
-
 //===========================================================================
 // TechDraw_StackGroup
 //===========================================================================