DDS12 — define both the Topic name and the Topic type_name separately

XML mapping file does not allow you to define both the Topic name and the Topic type_name separately

Summary:

In the DCPS, there is a clear distinction between a topic name and a topic type. (Both names must be provided when creating a Topic). However, the DLRL mapping XML only allows us to specify one name attribute which is called ‘name’. It is unclear whether this name should identify the type name or the topic name. Currently we just have to assume that the topic name and type name are always chosen to be equal, but that does not have to be the in a legacy topic model.

Proposed Resolution:

Add a second (optional) attribute to the mainTopic, extensionTopic, placeTopic and multiPlaceTopic that identifies the type name. If left out, the type is assumed to be equal to the topic name.

see above