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/qmlprofiler/qmlprofilerviewmanager.h

@@ -29,15 +29,11 @@
 #include "qmlprofilertraceview.h"
 #include "flamegraphview.h"
 
-#include <QObject>
-
 namespace Utils { class Perspective; }
 
 namespace QmlProfiler {
 namespace Internal {
 
-class QmlProfilerTool;
-
 class QmlProfilerViewManager : public QObject
 {
     Q_OBJECT