Include Google Talk presence, even when missing Im rows.

When inserting Google Talk presence updates, we match on
both Im and Email rows.  This change adds presence "dots"
to individual Im rows, and creates in-memory Im rows when
Email entries have presence.

This loads status details through a second query and holds
back building UI until both queries finish.  This change
also generalizes logic for building Im intents borrowed
from FastTrack code.

This change also fixes a regression that was dropping third-
party data rows.  The second-query approach above allows us
to remove a large chunk of code that was using old API.

Fixes http://b/2161796