Support CCC Command In FileZilla Server

[keving]

We would like to use FTPS to protect the login step only. We understand this only provides limited security but it does prevent the login and password from being stolen so it is better than plain unencrypted FTP.

Using CCC over full encryption also improves reliability when dealing with client side and server side routers / firewalls since the rest of the FTP communication can be followed / understood by them. This is extremely useful when you have no control over what hardware / software sits in-between the client and server.