Started to do a simple sshd configurator.

This only supports the config options that "makes sense". That means:
 * Port (chenge to non-standard port)
 * ListenAddress (bind to single ip or interface)
 * PasswordAuthentication (turn off to use public keys only)
 * UseDNS (will most likely needed to be turned off)

DONE:
 * Status
 * submit changes (controller)
 * expert tab

TODO:
 * validation/CFE'ify
 * Posibility to upload public keys
 * remove reminders from openntd (which the files were copied from)
 * log file

BUGS:
Could not be able to activate this function:
 * PermitRootLogin (forbid root to log in. To force use of sudo/su)
