this prepares cache/txn structures to hold API as well, so we can get
rid of the global api

this fixes a problem when module is unloaded at runtime
and active

the bindings wrote the keys on completion, so they existed
and __newindex was never called - now current {storage|size}
are saved as cache.current_{storage|size}

memcached is a distributed caching system, it is a good fit
for building resolvers with shared and replicated cache

the module memory not be moved (reallocd), turned array of modules to array of pointers to modules

this fixes a bug where resolution failed, but the finish callbacks thought the answer is noerror

this hooks into query resolution and collects counters on answers, queries and iterator