Add leap.eventstream() and cancelreq() functions.

leap.eventstream() is used when we expect the viewer's LLEventAPI to send an
immediate first response with the reqid from the request, followed by some
number of subsequent responses bearing the same reqid. The difference between
eventstream() and generate() is that generate() expects the caller to request
each such response, whereas eventstream calls the caller's callback with each
response.

cancelreq() is for canceling the background fiber launched by eventstream()
before the callback tells it to quit.

Make WaitFor:close() remove the object from the waitfors list; similarly, make
WaitForReqid:close() remove the object from the pending list. For this reason,
cleanup() must iterate over a copy of each of the pending and waitfors lists.

Instead of unregisterWaitFor() manually searching the waitfors list, use
table.find().

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