[Drawing] Gui: remove unused headers

- also some sorting
- also enable precompiled header

src/Mod/Drawing/Gui/AppDrawingGuiPy.cpp

@@ -22,29 +22,25 @@
 
 #include "PreCompiled.h"
 #ifndef _PreComp_
-# include <QFileInfo>
-# include <QIcon>
-# include <QImage>
 # include <sstream>
+
+# include <QFileInfo>
 #endif
 
-#include <CXX/Extensions.hxx>
-#include <CXX/Objects.hxx>
+#include <App/DocumentObjectPy.h>
+#include <Base/Exception.h>
+#include <Base/FileInfo.h>
+#include <Base/Stream.h>
+#include <Gui/BitmapFactory.h>
+#include <Gui/MainWindow.h>
 
-#include "DrawingView.h"
 #include <Mod/Drawing/App/FeaturePage.h>
 #include <Mod/Drawing/App/FeatureViewPart.h>
 #include <Mod/Drawing/App/ProjectionAlgos.h>
 #include <Mod/Part/App/PartFeature.h>
 
-#include <Base/Console.h>
-#include <Base/Exception.h>
-#include <Base/FileInfo.h>
-#include <Base/Stream.h>
-#include <App/Application.h>
-#include <App/DocumentObjectPy.h>
-#include <Gui/MainWindow.h>
-#include <Gui/BitmapFactory.h>
+#include "DrawingView.h"
+
 
 namespace DrawingGui {
 class Module : public Py::ExtensionModule<Module>