Removing UDP client pooling (MichaCo#146)

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

Readme update - url fix

Merge branch 'dev'

Fixing spelling mistakes and other minor things (MichaCo#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 (MichaCo#68)

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

Auto detect network name server changes (MichaCo#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 MichaCo#30

Reorganized testing zone files

Adjusting adit log to give more information on server errors and to n…

…ot print the message if there are no more servers

Forgot one checkin

Version suffix change