Say hello to QtQmlDevTools library

Say hello to QtQmlDevTools library

QtQmlDevTools is a private helper library. It provides QML/JS
file parsing for tools that live outside of the qtdeclarative
repository, such as lupdate.

This allows us to remove qttools's dependency on the
qtdeclarative sources.

To use the library:

QT += qmldevtools-private

 #include <private/qdeclarativejsparser_p.h>

Change-Id: Ia43751b9be3d9fe05da03e65c6aca1cd9e3fdbbc
Reviewed-on: http://codereview.qt-project.org/6116
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
Reviewed-by: Aaron Kennedy <aaron.kennedy@nokia.com>