List nodes in interactive mode

[ARMmaster17]

Add a command to list all available nodes on the network while in interactive mode. Must show:

1. Hostname
2. Current program and line (if any)
3. Last broadcast time
4. Ping time (if applicable)
5. IP address (IPv4 only for now)

[ARMmaster17]

Listing as wontfix until issue #31 and all dependent issues are resolved.