[TD] DrawD* - DrawT*: remove unused includes - part 2/2

- also sort includes
- also additions to precompiled header

src/Mod/TechDraw/App/DrawProjGroupPyImp.cpp

@@ -27,13 +27,13 @@
 
 #include "DrawProjGroup.h"
 #include "DrawProjGroupItem.h"
-
 // inclusion of the generated files (generated out of DrawProjGroupPy.xml)
 #include <Mod/TechDraw/App/DrawProjGroupPy.h>
 #include <Mod/TechDraw/App/DrawProjGroupPy.cpp>
 #include <Mod/TechDraw/App/DrawProjGroupItemPy.h>
 #include <Base/VectorPy.h>
 
+
 using namespace TechDraw;
 
 // returns a string which represents the object e.g. when printed in python