Revert the use of foundations as rubble placeholders for some random buildings from rP12717 as it just confuses players.
Do not use the legit rubble_3x3 actor from rP12719 as it isn't as appealing as rubble_stone_3x3.
Rename it to make it more obvious that the template stands out.

Split from: https://code.wildfiregames.com/D643
Refs #1166
Patch By: temple