Changed QML reading in QML designer to use the interpreter for property types.

src/libs/qmljs/qmljscheck.cpp

src/libs/qmljs/qmljsinterpreter.cpp

src/libs/qmljs/qmljsinterpreter.h

src/plugins/qmldesigner/core/model/texttomodelmerger.cpp

src/plugins/qmldesigner/core/model/texttomodelmerger.h