Gui: Optimize includes to reduce compile time

src/Mod/TechDraw/Gui/CommandExtensionPack.cpp

@@ -30,6 +30,7 @@
 # include <exception>
 #endif  //#ifndef _PreComp_
 
+# include <App/Document.h>
 # include <App/DocumentObject.h>
 # include <Base/Exception.h>
 # include <Base/Console.h>
@@ -42,6 +43,7 @@
 # include <Gui/Control.h>
 # include <Gui/Document.h>
 # include <Gui/Selection.h>
+# include <Gui/SelectionObject.h>
 # include <Gui/MainWindow.h>
 # include <Gui/FileDialog.h>
 # include <Gui/ViewProvider.h>