The new QML Inspector depends on DebuggerPlugin. Also added a dropdown menu into
the debugger toolbar from which the user can select the used debugging
language, e.g. C++ or QML.
no longer uses LocalAppRunConfiguration. QmlInspector now uses
the qmlviewer started by QmlProjectManager instead of starting
its own, and clicking the Start Debug button within a QML
project will switch to QML Inspect mode and start the inspector.
