Names for children

[Justus K]

Is your feature request related to a problem? Please describe.
If you are trying to log something like "... send me a message" (where me: Children, ...: Sender of msg), you have to print the long path (RefAddr::path()), but the path is super long and not really human-readable.

Describe the solution you'd like
Add a field name to RefAddr which holds a name as a string, like thread names.