Replace DnDns with HeijdenDns

HeijdenDns seems to do a better job at querying SRV records

MinecraftClient/Protocol/Dns/Records/RecordNS.cs

@@ -0,0 +1,43 @@
+using System;
+/*
+ 3.3.11. NS RDATA format
+
+    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+    /                   NSDNAME                     /
+    /                                               /
+    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+
+where:
+
+NSDNAME         A <domain-name> which specifies a host which should be
+                authoritative for the specified class and domain.
+
+NS records cause both the usual additional section processing to locate
+a type A record, and, when used in a referral, a special search of the
+zone in which they reside for glue information.
+
+The NS RR states that the named host should be expected to have a zone
+starting at owner name of the specified class.  Note that the class may
+not indicate the protocol family which should be used to communicate
+with the host, although it is typically a strong hint.  For example,
+hosts which are name servers for either Internet (IN) or Hesiod (HS)
+class information are normally queried using IN class protocols.
+ */
+namespace Heijden.DNS
+{
+	public class RecordNS : Record
+	{
+		public string NSDNAME;
+
+		public RecordNS(RecordReader rr)
+		{
+			NSDNAME = rr.ReadDomainName();
+		}
+
+		public override string ToString()
+		{
+			return NSDNAME;
+		}
+
+	}
+}