New structure type-Watchtower

[MrTrololo]

structure that player would be able to build via carpentry and/or welding-will provide good view on surroundings and in addition would give opportunity to take down anything that moves from high ground with ranged weapons-zombie or not,zombies would be able to tear it down and make character fall,eventually leading to breaking bones and being mauled alive, and here's next reason to introduce working ladders, by the way would be nice to see it in military base and other places previously occupied by army, also when NPC gonna make great return their outposts (if they are planned) should contain them near entrances, would appear in two variants-wooden and more durable metal ones

[duh7]

Yes we need alternativ for clothe ropes.