These are no longer generated in Viewer 2.0 (instead we use
notifications to send object IMs to the user), so there's no
need to look for them in every textbox. Users can get details
on any objects spamming them via the new remote object inspector.

with an event API. In addition to the LLEventPump name on which to listen,
LLEventAPI accepts a documentation string for event API introspection.
Give every LLEventDispatcher::add() overload a new documentation string
parameter for event API introspection.
Convert every existing event API to new conventions, introducing suitable
documentation strings for the API and each of its operations.

merge -r119443 - basic slurl handling
ignore dead branch