Add missing properties to /config get|set

[grilledham]

Currently it doesn't appear to be possible to get or set the server's name, description or tags with /config get or /config set.

It is possible to edit those values with the gui that pops up with /config.

However, for my use case, I'd like to be able to edit the values from the server console, so I need to be able to use a command.

[Rseding91]

I've added them for the next version of 0.17.

[grilledham]

Thank you