Add support to send GRP UNAFFIL network announcement

Constants.cs

@@ -184,6 +184,7 @@ namespace fnecore
         public const byte NET_ANNC_SUBFUNC_GRP_AFFIL = 0x00;                    // Announce Group Affiliation
         public const byte NET_ANNC_SUBFUNC_UNIT_REG = 0x01;                     // Announce Unit Registration
         public const byte NET_ANNC_SUBFUNC_UNIT_DEREG = 0x02;                   // Announce Unit Deregistration
+        public const byte NET_ANNC_SUBFUNC_GRP_UNAFFIL = 0x03;                  // Announce Group Affiliation Removal
         public const byte NET_ANNC_SUBFUNC_AFFILS = 0x90;                       // Update All Affiliations
 
         /*

FnePeer.cs

@@ -269,6 +269,21 @@ namespace fnecore
             FneUtils.Write3Bytes(dstId, ref res, 3);
 
             SendMaster(CreateOpcode(Constants.NET_FUNC_ANNOUNCE, Constants.NET_ANNC_SUBFUNC_GRP_AFFIL), res, 0, 0, true);
+
+        }
+
+        /// <summary>
+        /// Helper to send group affiliation removal announcement to the master.
+        /// </summary>
+        /// <param name="srcId"></param>
+        public void SendMasterGroupAffiliationRemoval(uint srcId)
+        {
+            // send message to master
+            byte[] res = new byte[3];
+
+            FneUtils.Write3Bytes(srcId, ref res, 0);
+
+            SendMaster(CreateOpcode(Constants.NET_FUNC_ANNOUNCE, Constants.NET_ANNC_SUBFUNC_GRP_UNAFFIL), res, 0, 0, true);
         }
 
         /// <summary>