Utp packet heap

[ScottyPoi]

Replaces uTP Packet Queue array with Heap from heap-js.

Heap will sort packets waiting in queue so that out-of-order packets are reordered. This will cut back on unnecessary Selective Ack responses.

When receiving streams, especially from Trin nodes, we often receive pairs of packets with identical timestamps, and regularly end up processing them in the wrong order.

• For example, we receive packets 1 and 2 simultaneously, but process packet 2 then packet 1. Next we recieve 3 and 4, but process 4 before 3.
• This results in a lot of extra packets being exchanged due the the Selective Ack function. We report every other packet at missing, even though it isn't. So We get multiples of every other packet and send extra ACK packets.

The processCurrentPacket method was updated to skip repeat packets, and to requeue packets that arrive ahead of the current reader position. This update allows the packet-pair phenomenon to self correct.

Also updated and improved some logs, and added a method to report the total number of open uTP streams.

[acolytec3]

Looks great, with one change for clarity needed I think. Otherwise, go ahead and merge and don't wait for an approval from me

[acolytec3]

LGTM