Register qml.qch file automatically in help collection

Automatically register qml.qch if found in shared/help/qtcreator.
This is needed for the special 'creator-qml' package.

src/plugins/qmlprojectmanager/qmlprojectplugin.cpp

@@ -42,7 +42,6 @@
 #include <texteditor/texteditoractionhandler.h>
 
 #include <QtCore/QtPlugin>
-#include <QtCore/QDebug>
 
 using namespace QmlProjectManager;
 using namespace QmlProjectManager::Internal;