xantispam: Go by intentory handling rules when any origins are
configured for it.  Otherwise inventory handling rules can be
overridden by other rules, especially when non-relaxed mode is
enabled.
xantispam: added request handler for silent requests to add rule
"&-ConfigInverseOrderForSilent" which can change the order from 'deny,
allow' to 'allow when not denied' for friend online status
notifications which allows whitelisting such notifications only for
those friends you want to see them for rather than having to blacklist
all the ones you don't want to see when not in relaxed mode