string so it can appear in a D-Bus address as the value
part of a key-value pair.
For instance, if
this function would return
which could be used in a D-Bus address like
An unescaped string to be included in a D-Bus address as the value in a key-value pair.
|The data is owned by the caller of the function.|
|The value is a NUL terminated UTF-8 string.|