QmlJsInspector: implemented Property Inspector

src/libs/utils/crumblepath.cpp

src/libs/utils/crumblepath.h

src/plugins/qmljseditor/qmljseditor.cpp

src/plugins/qmljsinspector/qmlinspectortoolbar.cpp

src/plugins/qmljsinspector/qmlinspectortoolbar.h

src/plugins/qmljsinspector/qmljsclientproxy.cpp

src/plugins/qmljsinspector/qmljsclientproxy.h

src/plugins/qmljsinspector/qmljscontextcrumblepath.cpp

src/plugins/qmljsinspector/qmljscontextcrumblepath.h

src/plugins/qmljsinspector/qmljsinspector.cpp

src/plugins/qmljsinspector/qmljsinspector.h

src/plugins/qmljsinspector/qmljsinspector.pro

src/plugins/qmljsinspector/qmljsobjecttree.cpp

src/plugins/qmljsinspector/qmljsobjecttree.h