Add filters for walls and floors

[TanyaPegasus]

These are categories people are often asking about, and wanting to search by, and are relatively easy to create filters for.

Floors:
Object files will contain floor=1
Search returns 68 objects (including some uncraftable floors, and some categories which should already be filtered out elsewhere).

Walls:
Slightly more complicated. Objects will contain either wallLayer=1 or floorHugging=1
This is the same filter that can be found in OneLife here:
https://github.com/twohoursonelife/OneLife/blob/b1278179558869c0c07003785e8f083231a0f4ab/gameSource/objectBank.cpp#L617-L620

The use case for this filter in the game is a little different, so this search does also return some potentially unwanted items. If we don't mind showing all items that are potentially insulating as well as literal walls etc, we can stop there. That would keep the feature the same as what would be returned in game.

An additional 119 items (less if not including categories and uncraftables), can be filtered out if we also check that the object name contains "wall", "door", "arch", or "fence".
These items include variations of hitched horses, shelters, the freestanding shelves, silk farms, clothing racks, bell towers, ovens, kilns, and sign panels,