Replace DnDns with HeijdenDns

HeijdenDns seems to do a better job at querying SRV records

MinecraftClient/Protocol/Dns/Records/RecordKX.cs

@@ -0,0 +1,65 @@
+using System;
+/*
+ * http://tools.ietf.org/rfc/rfc2230.txt
+ * 
+ * 3.1 KX RDATA format
+
+   The KX DNS record has the following RDATA format:
+
+    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+    |                  PREFERENCE                   |
+    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+    /                   EXCHANGER                   /
+    /                                               /
+    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+
+   where:
+
+   PREFERENCE      A 16 bit non-negative integer which specifies the
+                   preference given to this RR among other KX records
+                   at the same owner.  Lower values are preferred.
+
+   EXCHANGER       A <domain-name> which specifies a host willing to
+                   act as a mail exchange for the owner name.
+
+   KX records MUST cause type A additional section processing for the
+   host specified by EXCHANGER.  In the event that the host processing
+   the DNS transaction supports IPv6, KX records MUST also cause type
+   AAAA additional section processing.
+
+   The KX RDATA field MUST NOT be compressed.
+
+ */
+namespace Heijden.DNS
+{
+	public class RecordKX : Record, IComparable
+	{
+		public ushort PREFERENCE;
+		public string EXCHANGER;
+
+		public RecordKX(RecordReader rr)
+		{
+			PREFERENCE = rr.ReadUInt16();
+			EXCHANGER = rr.ReadDomainName();
+		}
+
+		public override string ToString()
+		{
+			return string.Format("{0} {1}", PREFERENCE, EXCHANGER);
+		}
+
+		public int CompareTo(object objA)
+		{
+			RecordKX recordKX = objA as RecordKX;
+			if (recordKX == null)
+				return -1;
+			else if (this.PREFERENCE > recordKX.PREFERENCE)
+				return 1;
+			else if (this.PREFERENCE < recordKX.PREFERENCE)
+				return -1;
+			else // they are the same, now compare case insensitive names
+				return string.Compare(this.EXCHANGER, recordKX.EXCHANGER, true);
+		}
+
+	}
+}