DDSXTY12 — Built-in annotations should be in DDS namespace

Found by: Rick Warren, RTI (rick.warren@rti.com)
Severity: Minor

Problem:
The IDL Type Representation uses so-called "built-in annotations" to attach metadata to type definitions. The hypothetical module in which these annotations are defined is unclear. On the one hand, all (other) types defined by the specification are in the DDS:: module. However, in the case of the built-in annotations, no module is specified.

Proposed Resolution:
Clearly indicate that all built-in annotations are notionally in the DDS:: module

Merge with DDSXTY12-34

This can be treated together with DDSXTY12-34 which is already aligning annotations with the syntax of IDL4