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/project.cpp

@@ -33,6 +33,7 @@
 #include "kit.h"
 #include "kitinformation.h"
 #include "projectexplorer.h"
+#include "projectexplorerconstants.h"
 #include "projectnodes.h"
 #include "runconfiguration.h"
 #include "session.h"
@@ -54,6 +55,7 @@
 
 #include <utils/algorithm.h>
 #include <utils/environment.h>
+#include <utils/fileutils.h>
 #include <utils/macroexpander.h>
 #include <utils/pointeralgorithm.h>
 #include <utils/qtcassert.h>