Fixed issue with furniture not display

Everything is now displaying as "correctly" as it was before we started adding object manipulation. However, there are still a few small issues with the furniture layout that have been present since earlier versions:
1) The furniture is shifted a bit too far to the left, putting some of the chairs slightly off the edge of the floor, and leaving the corresponding sets on the right too far onto the floor.
2) Right now, in order to make sure furniture is sitting properly on top of the floor (instead of sitting partially inside it), I'm hardcoding a +y 0.5 translation into all floor-level furniture items. I'm still not entirely sure why this has to be done here, and not above in the furnitureRoot translation, but for some reason it only seems to work this way. There's two problems with this: it's a hardcoded hack that probably won't work for more generic meshes and such; and it's probably also what was keeping stacking from working right.