handle damaged vs undamaged by returning routers interested in both, and letting them decide.

caching for providers,crafters,extractors and qsort is now complete
cache only updated once per tick, so items will take 1 tick to be
noticed, rather than the same tick :) ... such is the horible price of
caching ...
(actual deliveries/extracts are still done vs real inventories, so
nothing lost there)