qmljs: use new qml parser

adds support for singleton and getter/setter properties

Change-Id: Ia6691ac7799a46885db0df44617617dcc3c13189
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/libs/qmljs/parser/qmljsengine_p.h

@@ -91,6 +91,7 @@ public:
     ~Engine();
 
     void setCode(const QString &code);
+    const QString &code() const { return _code; }
 
     void addComment(int pos, int len, int line, int col);
     QList<AST::SourceLocation> comments() const;