blueprints and templates for buildings (or multiple)

currently when you build a new structure it just gets the default interior.
but if you take your time to make a structure look like you want, you might want the others to look the same. be it for functionality or simply for looks.

my recommendation is to do it a bit like in anno. you should be able to select one building or more, copy it, and paste it somewhere, so that the whole interior is copied too.

optionally, you could even select multiple buildings at once, and copy them as one big structure, that could be especially helpful for complex stuff like the lords manor.