Art-Net 4 node discovery is not fully supported

[alamaral]

In the Art-Net 4 protocol release v1.4 doc, in section Art-Net overview/Art-Net 4: is this paragraph:

Art-Net can address over 30,000 universes. Previously, each group of 4 DMX ports were
limited to universes from a consecutive block of 16. Art-Net 4 allows this limit to be
resolved as the developer can choose to identify each DMX port individually. This simply
means encoding a single DMX port in each ArtPollReply. Using this mechanism, all DMX
ports can be assigned a fully independent universe.

What this means is that a device which support ArtNet 4 can send multiple ArtPollReply's for a single
node, which only contains the information for that specific port on that node. The BindIndex contains
the index of the port that the information pertains to. Currently a device which sends this type of
ArtPollReply will cause the ArtNetNode to be updated multiple times for every ArtPoll request, once
for each Reply, with only a single port's worth of information (instead of containing all the ports for
that node), and if listeners are setup it will constantly do multiple callbacks telling the listener that
the node has disconnected and a new node has connected.

I believe that what should happen is that if there is already a Node with a matching IP address, then
the node should use the information in the packet to either add a new port, based on the BinIndex, or
to update an existing port, if the data is different. If a port is added or updated then listeners should be
informed.