Include annotation property values in output.

When editing annotations, we want the ability *not* to overwrite any
existing annotation properties already in place. Include any properties
set on the annotation in the output, so that the edit_annotations script
can know that they're there.

The annotation properties are encoded like URL query parameters for
convenience; it makes them easy to encode here & subsequently decode on
the other side (in Python).

Test: m framework-annotation-proc & inpsect output.
Change-Id: I71fb1215ad2790751be336b4955c163bb323a4a6