Support server nicknames

[Aptimex]

Let users specify server nicknames via configure and add server. Nicknames should be displayed in the status output.

Would also be nice to be able to optionally replace some args like --server-address with a server's nickname and have it deduce the correct API address from that.

[Aptimex]

Moving the --server-address idea to its own separate issue since that's going to require a separate effort to implement.