Island hashcode feature added.

src/main/java/ca/recrown/islandsurvivalcraft/world/IslandWorldMap.java

@@ -200,4 +200,8 @@ public class IslandWorldMap {
     public Point2 findIslandOrigin(int worldX, int worldZ) {
         return findIslandOrigin(worldX, worldZ, null);
     }
+
+    public int calculateIslandHash(int worldX, int worldZ) {
+        return findIslandOrigin(worldX, worldZ).hashCode();
+    }
 }