Towers rework

Going through the towers is boring - we all know that we all try to minimize the time spent on them. My proposal is to remove them and allow us to "raise them". On a node where we would like to place a tower, next to a waystone we add also a tablet. In case of a failure, we would not be able to build a tower in this node again. Additionally, constructing a tower within the range of another could have additional cost - e.g. in gold.

Just quadruple the amount of rares on those maps, to give an incentive to run them. Simple. Effective.

Old towers were good because you can skip bad maps with them. New towers we be another chore. Terrible.