Fixed several more app crashes

Fixed several more app crashes. This time it will take some time for the new version to be approved. Most notably, there’s a nasty crash when closing a designations or buildings menu with the Close button. If you want to close the menu without selecting a designation, just select any and cancel it to avoid the crash for now. Also, some users reported an issue when the map stays black after connecting to a server, but buttons and menus work. Reportedly, this can be fixed by going to Settings menu and choosing a tileset (even if there’s only the default one in the list). I’m also fixing things in server code if needed, you will be asked to update next time you connect to a server.