Add QML folder in project tree, show files there

Use the full path for folders to sort in the project tree.

For virtual folders ensure that the path ensures the sorting we want.

Reviewed-By: kkoehne

src/plugins/qmlprojectmanager/qmlprojectnodes.cpp

@@ -204,6 +204,13 @@ bool QmlProjectNode::removeFiles(const ProjectExplorer::FileType /*fileType*/,
     return false;
 }
 
+bool QmlProjectNode::deleteFiles(const ProjectExplorer::FileType /*fileType*/,
+                                 const QStringList & /*filePaths*/)
+{
+    return false;
+}
+
+
 bool QmlProjectNode::renameFile(const ProjectExplorer::FileType /*fileType*/,
                                     const QString & /*filePath*/, const QString & /*newFilePath*/)
 {