Improvements to autobuf

[perlsaiyan]

Needs a generalized buf handler with support for prefs. Fires events when MSDP_AFFECTS reaches minimum threshold.

pref affect[sanctuary][threshold] 1 pref affect[sanctuary][handler] potion

... something like that.

[perlsaiyan]

have autobuf registry now, with subscribed affect iteration. pref autobuf sanct method threshold

or short-form pref sanctuary method threshold pref sanctuary method pref sanctuary threshold

threshold defaults to 1 if not given

[chosig]

Perhaps something like pref sanctuary on|off pref set sanctuary method threshold