Issue #28: Changed to new packet format.
Added todo.
Removed DeltaPacketClient class.
Added unit tests for client delta packets.
Still trying to pass unit tests.
Passes PacketNoAck unit tests.
Clearing up the packet classes.
Renamed packet classes.
Ranamed PacketDeltaFragmentManager to PacketFragmentManager.
IStateManager.DeltaParse ack packet is optional.
Added todos dealing with optional Acks.