Added YachtEvent message with encoder and decoder

- Updated Encoder and Decoder factories for the new message type
- Added an enum for handling yacht event types

#story[1100]

racevisionGame/src/main/java/network/MessageDecoders/DecoderFactory.java

@@ -39,7 +39,7 @@ public class DecoderFactory {
 
             case RACESTARTSTATUS: return new RaceStartStatusDecoder();
 
-            //case YACHTEVENTCODE: return new YachtEventCodeDecoder();//TODO
+            case YACHTEVENTCODE: return new YachtEventCodeDecoder();
 
             //case YACHTACTIONCODE: return new YachtActionCodeDecoder();//TODO
 

racevisionGame/src/main/java/network/MessageDecoders/YachtEventCodeDecoder.java

@@ -0,0 +1,47 @@
+package network.MessageDecoders;
+
+import network.Exceptions.InvalidMessageException;
+import network.Messages.AC35Data;
+import network.Messages.Enums.YachtEventEnum;
+import network.Messages.YachtEvent;
+
+import java.util.Arrays;
+
+import static network.Utils.ByteConverter.bytesToInt;
+import static network.Utils.ByteConverter.bytesToLong;
+import static network.Utils.ByteConverter.bytesToShort;
+
+/**
+ * Decodes {@link YachtEvent} messages.
+ */
+public class YachtEventCodeDecoder implements MessageDecoder {
+    private YachtEvent message;
+
+    @Override
+    public AC35Data decode(byte[] encodedMessage) throws InvalidMessageException {
+        // Deserialise message
+        byte[] timestamp = Arrays.copyOfRange(encodedMessage, 1, 7);
+        byte[] ackNum = Arrays.copyOfRange(encodedMessage, 7, 9);
+        byte[] raceID = Arrays.copyOfRange(encodedMessage, 9, 13);
+        byte[] sourceID = Arrays.copyOfRange(encodedMessage, 13, 17);
+        byte[] incidentID = Arrays.copyOfRange(encodedMessage, 17, 21);
+        byte eventID = encodedMessage[21];
+
+        // Unpack bytes into YachtEvent
+        this.message = new YachtEvent(
+                bytesToLong(timestamp),
+                bytesToShort(ackNum),
+                bytesToInt(raceID),
+                bytesToInt(sourceID),
+                bytesToInt(incidentID),
+                YachtEventEnum.fromByte(eventID)
+        );
+
+        // Return YachtEvent
+        return message;
+    }
+
+    public YachtEvent getMessage() {
+        return message;
+    }
+}