Adds a DoubleLocklessQueue and uses it for the outgoing buckets. Added
a flag value to the Throttle Type (again) because although it's hacky, it's
the best of a bad bunch to get the message through the UDP stack to where it's
needed.
* Change the OnQueueEmpty firing to use a minimum time until next fire instead of a sleep
* Set OutgoingPacket.TickCount = 0 earlier to avoid extra resends when things are running slowly (inside a profiler, for example)
resending, timeouts, packet discarding. Add notification event for
packet discarding. Add priority scheduling for packet queues.
Add outgoing duplicate detection facility. Correct packet sequencing.
Make provisions for automatic server side throttle adjustments (comes
in next installment)