* avoid allocation in `hash(ValidIpAddress)`
While casually browsing the profiler output, to my great surprise I
found that an allocating string conversion function (gasp!) in the hash
function for ip addresses - this PR carefully excises this evil
construct from the codebase.
* bump nim version
* Add search for best route and refactor setupNat to setupAddress
* Update setupAddress and make enr ports in discovery optional
* Add specific error log when no route is found
* Use bindIP if it is public
* Adjust some log levels
* Add ip limits to routing table and routing table buckets
* Fix order of ip limit check and duplicate check for replacement
* Fix ip limit for node with updated ip in ENR
* Fix bug where address wouldn't update on ENR update
and update some comments
* Reuse some add/remove code in routing table
* Fix seen bug on ENR update in routing table
* Rework addNode to make sure to do address check always
and adjust some logs.
* More documentation on the ip limits in routing table [skip ci]
Kim De Mey
Jacek Sieka