Second Townbell

Allow to build second townbell with nice function. I mean, after if first townbell is destroed, this second will take controll. This could allow us to make better defence(make raiding a bit more time draining). Also should make a bit more of slver drain ![Trollface ¦]](./images/smilies/troll.gif)
![Trollface ¦]](./images/smilies/troll.gif)