Remove buildings from the vanilla theme.

[boformer]

Based on this reddit comment:

There's one ,just one building I can't handle. it's the european one that's often blue and orange and has a rounded roof. It's pretty realistic, I know, but I generally dislike that direction in architecture, so i tend to manually buldoze it every time it pops up.

We could extend the config format like this:

    <Theme name="European">
      <Buildings>
        <Building name="ugly_vanilla_blueroof_building" include="false" />
      </Buildings>
    </Theme>

[bloodypenguin]

Yes I thought about that too. That brings back blacklist idea :)

[bloodypenguin]

working on it