Please add ability to expand pig shops

[shadowDigga]

I think it should be possible to expand pig shops to 'support their business' and give them more rooms to sell stuff. This way it would be possible to have higher chance of having desired item on sale in one shop (because there would be multiple rooms) instead of having to build multiple pig shops. (Same as it went with Slanty Shanty, people preferred ability to expand their house and have a single one than having multiple houses).