[TD] DrawView*: remove unused includes - part 1

- also sort includes
- also additions to precompiled header

src/Mod/TechDraw/App/DrawViewCollectionPyImp.cpp

@@ -23,11 +23,11 @@
 #include "PreCompiled.h"
 
 #include "DrawViewCollection.h"
-
 // inclusion of the generated files (generated out of DrawViewCollectionPy.xml)
 #include <Mod/TechDraw/App/DrawViewCollectionPy.h>
 #include <Mod/TechDraw/App/DrawViewCollectionPy.cpp>
 
+
 using namespace TechDraw;
 
 // returns a string which represents the object e.g. when printed in python