This PR will lead us towards the Promised Day, for in its wake there shall be much celebration and ecstasy as this world becomes a world suitable for developer hegemony. The first strike is thusly;
All << is converted into to_chat().
changes:
Added a isopenturf() macro, equivalent to istype(thing, /turf/simulated/open).
Converted most/all instances of istype(/turf/simulated/open) to isopenturf().
Made update_above()' aware of queue status & inlined a proc-call.