Code cosmetics

Mostly unused #include's, also sort them or reduce scope.

A few namespaces, ...

Change-Id: I9ee71e07de7157c9942125672addf87dd41e78f1
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/projectexplorer/buildsteplist.cpp

@@ -25,11 +25,9 @@
 
 #include "buildsteplist.h"
 
-#include "buildconfiguration.h"
 #include "buildmanager.h"
 #include "buildstep.h"
-#include "deployconfiguration.h"
-#include "projectexplorer.h"
+#include "projectexplorerconstants.h"
 #include "target.h"
 
 #include <utils/algorithm.h>