Click support and argument deprecation

Hab auch demos für alles mal gebaut :)

examples/argparse-example.py

+from netdb_client.api41 import APIEndpoint, APISession, dns
+
+from netdb_client.util.argparse_helper import ArgumentParser
+
+parser = ArgumentParser()
+
+args = parser.parse_args()
+
+endpoint = APIEndpoint(base_url=args.netdb_base_url, token=args.netdb_token)
+api = APISession(endpoint)
+
+fqdn = dns.Fqdn.list(api, value_old='net.scc.kit.edu')
+
+print(fqdn)