PropertyHandle :: RegisterIntern - Register property handle internally

The function will register the property handle resource (node) from the property handle passed in the current property handle without increasing the resource use count. Internally registered property handles must be unregistered before closing or destructing the property handle.

The function is used to avoid deadlocks when referring to a property handle in the subordinated object of the property handle, e.g. when creating a copy for the property handle in its context class.