Add realm switching

Fix realm unlock items

src/main/java/emu/grasscutter/game/player/Player.java

@@ -386,6 +386,11 @@ public class Player {
             return;
         }
         this.realmList.add(realmId);
+
+        // Tell the client the realm is unlocked
+        if(realmId > 3){ // Realms 3 and below are default 'unlocked'
+            this.sendPacket(new PacketHomeModuleUnlockNotify(realmId)); // Update needs scene change?
+        }
     }
 
     public int getExpeditionLimit() {