Add ODB mapping registration for IPv6

odb/ng/Mapper.cs

@@ -107,6 +107,11 @@ namespace ln.types.odb.ng
             RegisterMapping<IPv4>(
                 (mapper, value) => new ODBUInteger(value.AsUInt),
                 (mapper, oval) => new IPv4(oval.As<uint>())
+                );
+
+            RegisterMapping<IPv6>(
+                (mapper, value) => new ODBByteBuffer(value.ToCIDRBytes()),
+                (mapper, oval) => new IPv6((oval.As<byte[]>()))
                 );
 
 			ObjectMapping = new mappings.ObjectMapping();