Update ctcp_notifier.cpp

This module now is able to retrieve the CTCP's you already have loaded, introducing
  the command 'setup [unload]'
  (It is unable to determine when you change anything about it.
   The best way to solve this is to issue 'setup unload' before changing ctcp responses,
   and then call 'setup' when you have modified your ctcp respones to reload your setup.
   Or to manually make those modifications.)

The command 'showall' now persists through znc restarts.

All stored content is now prefixed with 'ctcp_'.

Removed Info.SetHasArgs() and Info.SetArgsHelpText() as there were no args.