[Drawing] App: remove unused headers

- also some sorting
- also enable precompiled header

src/Mod/Drawing/App/AppDrawingPy.cpp

@@ -21,18 +21,17 @@
  ***************************************************************************/
 
 #include "PreCompiled.h"
+#ifndef _PreComp_
+# include <boost/regex.hpp>
+#endif
 
-#include <CXX/Extensions.hxx>
-#include <CXX/Objects.hxx>
-
-#include <Mod/Part/App/TopoShapePy.h>
-#include "ProjectionAlgos.h"
 #include <Base/Console.h>
 #include <Base/Interpreter.h>
 #include <Base/VectorPy.h>
-#include <boost/regex.hpp>
-
 #include <Mod/Part/App/OCCError.h>
+#include <Mod/Part/App/TopoShapePy.h>
+
+#include "ProjectionAlgos.h"
 
 
 using namespace std;