Action packets now sent at regular 20ms intervals

#issue[38] #implement

src/main/java/seng302/gameServer/server/messages/BoatActionType.java

@@ -13,7 +13,8 @@ public enum BoatActionType {
     SAILS_OUT(3),
     TACK_GYBE(4),
     UPWIND(5),
-    DOWNWIND(6);
+    DOWNWIND(6),
+    MAINTAIN_HEADING(7);
 
     private final int type;
     private static final Map<Integer, BoatActionType> intToTypeMap = new HashMap<>();