work in progress rust replacement for tinydns that will by default answer with the address of the resolver

changes associated with compiler appeasement; naming event handlers for better dumping; reducing the number of event insertions that scan to avoid duplicates, particularly when the argument is brand-new and cannot appear as a duplicate, based on profiling output on salt that showed 22% or more cpu being used in traversing the event queue

general testing and avoidance of a roundabout double-free possibility in test code teardown of expectation state

adapt to modern timeout library that deprecates unscoped timeout(), omit checking probetime and resptime types since they are now a Time instead of a Data