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/plugins/qmljstools/qmljssemanticinfo.cpp

@@ -40,7 +40,7 @@ namespace {
 
 // ### does not necessarily give the full AST path!
 // intentionally does not contain lists like
-// UiImportList, SourceElements, UiObjectMemberList
+// UiHeaderItemList, SourceElements, UiObjectMemberList
 class AstPath: protected AST::Visitor
 {
     QList<AST::Node *> _path;