NuGet updates and cleanup (#229)

Adding .NET 6 target and minor improvements (#169)

Ignoring any Microsoft.Win32.Registry related errors

Removing UDP client pooling (#146)

Removing UDP client pooling 
+ some bug fixes: #132, #145, #136, #133

Readme update - url fix

Merge branch 'dev'

Fixing spelling mistakes and other minor things (#70)

* Fixing spelling mistakes
* Adding fallback to the Target of the SRV record in ResolveService extensions.

Fixing memory leak when using nameserver discovery and NetworkAddress…

…Changed events (#68)

Removing usage of NetworkChange.NetworkAddressChanged usage to refresh discovered name-servers.

Auto detect network name server changes (#66)

* Using `NetworkChange` event to react on changing network adapters
* Periodically re-run `NameServer.ResolveNameServers` to check if the configuration changed

Calculated ttl rework. Updated unit tests after PR merge #30

Reorganized testing zone files