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/cmakeprojectmanager/cmakeprojectnodes.h

@@ -51,6 +51,8 @@ public:
     virtual bool removeFiles(const ProjectExplorer::FileType fileType,
                              const QStringList &filePaths,
                              QStringList *notRemoved = 0);
+    virtual bool deleteFiles(const ProjectExplorer::FileType fileType,
+                             const QStringList &filePaths);
     virtual bool renameFile(const ProjectExplorer::FileType fileType,
                              const QString &filePath,
                              const QString &newFilePath);