Allow to sort and possibly color code clients in the network list

As the client list is seemingly randomly selected, when you have multiple types of devices, it would be nice to be able to sort and color code them. Just a simple drag to rearrange and then color could be configured under the wrench or on a column for itself.

Nodes are sorted by their ZeroTier ID. There’s also an option in the header to sort them by the name field. Those are the only sort options we currently have, though.