Added the new terrain "visited house", which is graphically closed, but the "visit" command can be used as many times as you want. And for the houses in Chapter 6 that can be visited as many times as you like, will change the terrain to a "visited house" once you visit them.
In a past update, I added 14 visitable houses in Chapter 6, but the houses that only gave you information did not close when you visited them, it was easy to lose track of which ones you had already visited and decide not to go to all of them anymore because thinking about it was too much of a hassle.
This made it meaningless to include text in the houses to explain the specifications. So the purpose of this addition is to make it easier to see the houses you visited.
