Parse AdditionalAddresses

[farmio]

don't use them in the result yet.

IP Secure interfaces use BusInterface to transport name and leave the name attribute of AdditionalAddress tags an empty string. I don't know how BusInterface[@AddressIndex] relates to an AdditionalAddress tag.

Also there are no communication objects for AdditionalAddress so maybe they should have their own root key in the final result. A BusInterface may have Connectors containing their Associations as GroupAddressRefId - which doesn't really add to our current reference schema (GroupAddress -> CommunicationObject and Device -> CommunicationObject) 😬