Ant build editor allows renaming targets and properties. As far as I know the
only way to allow rename is for an element to implement PsiNamedElement. As I'm
annotating custom XML format, I don't have direct access to what the XmlTag
(It sounds like maybe this is what ElementManipulator is for, but when I
register an ElementManipulator, its method is never called.)
How can I create renamable elements in an XML file?