This fixes several problems. First
sending a fake event through the
onEventUpdate stream was not a
good design and lead to problems
if you expect a timeline event but
then are unable to build the
event from json. This now uses
a new stream in the Client which
is listened to in the timeline to
delete an event which should be
much more reliable.
It also now throws an exception
if deleting the event fails
instead of returning true or false.
A deprecation note is added.