Serveroption Improovements

[Python523]

I was thinking that these two improovements could be useful
1.)
Enable the ghost mode for non staff accounts for all servers (I forgot the exact server option name)
2.)
A feature like privateserver=true/false
it will allow you to toggle your server between only showing for staff or not, It could be useful if you want to fix a few things or just don't want anyone to see the server for a few days