Add /sync command to alleviate door related sadness

Run /sync if your doors disappear. This will resync your local client
with the server state. For more information, please see the associated
changelog entry.

TShockAPI/DB/GroupManager.cs

@@ -64,7 +64,8 @@ namespace TShockAPI.DB
 						Permissions.canlogin,
 						Permissions.canpartychat,
 						Permissions.cantalkinthird,
-						Permissions.canchat));
+						Permissions.canchat,
+						Permissions.synclocalarea));
 
 				AddDefaultGroup("default", "guest",
 					string.Join(",",