Replace DnDns with HeijdenDns

HeijdenDns seems to do a better job at querying SRV records

MinecraftClient/Protocol/Dns/Records/RecordTXT.cs

@@ -0,0 +1,38 @@
+using System;
+
+#region Rfc info
+/*
+3.3.14. TXT RDATA format
+
+    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+    /                   TXT-DATA                    /
+    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+
+where:
+
+TXT-DATA        One or more <character-string>s.
+
+TXT RRs are used to hold descriptive text.  The semantics of the text
+depends on the domain where it is found.
+ * 
+*/
+#endregion
+
+namespace Heijden.DNS
+{
+	public class RecordTXT : Record
+	{
+		public string TXT;
+
+		public RecordTXT(RecordReader rr)
+		{
+			TXT = rr.ReadString();
+		}
+
+		public override string ToString()
+		{
+			return string.Format("\"{0}\"",TXT);
+		}
+
+	}
+}