Added auto-store for containers, fixed several bugs.

● Added an auto-store feature for storage boxes: automatically deposits matching items from your backpack into the container based on what's already inside.

● Added 2 more belt slots.

● Attempted to fix the "ghost tree" bug.

● Fixed a bug where workbenches or some small models would fade out when slightly farther away (this issue widely existed across many models, making this patch unusually large – apologies).

● Fixed a null reference bug when zombies attacked walls.

● Fixed an array out-of-bounds bug in the zombie pathfinding system.

● Fixed a null reference bug that occurred when placing an engine on a "rotor" to start generating power.

● Fixed an array out-of-bounds bug when switching to "fog" weather.