1.610 Update - town signs and shelving stacks

- added both town sign posts

- shelves can be stacked

- door open/close state is now saved

- filtering deployables in the resource count now filters door and window parts

- fixed a bug that prevented flipping doors and window parts while placing

Made some item adjustments for better Rust accuracy, more notable changes were:
- the locker model was too big, did this change in Rust at some point?
- fridge collider was too small
- large planter collider was slightly too big

There was also a small patch before the holidays with the snowman and xmas tree.

Besides work on this update I've been slogging through adding electricity in Fortify with so much more to do.