DDS15 — Organize definitions of Time_t, Duration_t and other common types in the PIM

The PIM contains definitions for most of the "reference semantic" classes. But it does not directly define the "value semantic" classes such as: Time_t, Duration_t, SequenceNumber_t, InstanceHandle_t, StatusKind, StatusMask, etc.

Some types like ReturnCode_t are defined. But this is done in an odd place: (section 2.2.1.1 'Format and Conventions').

The PIM would be more clear if these types were all defined clearly in a centralized place. For example the Infrastructure module.

This issue should be treated as a "Blocker" so it is resolved ahead of other issues. That way the other issues can refer to the new definitions and organization.