This PR moves sinks to layer 3.2 as opposed to 3, the object layer.
Sinks are coded in with a pixel displacement and kitchen sinks are large enough for the collision check to fail if the sink is against a solid structure on an above layer, such as a window or an airlock.
Another big issue is that it looks bad
This is at the cost of 3 pixels appearing on top of a window if placed facing south against one, so this isn't a complete fix to the aesthetic of it, the primary focus of the PR is to make the sink interactable, and even then I believe it's a better trade-off:
8f869b659b