Standing Slabs

Fixed crash/reboot when using Minimap mods by optimizing model caching.

The Problem:
A good mod plays well with other mods. Every time a minimap looked at a "Standing Slab," the CPU had to measure a full block, and manually saw it in half to serve it. When the Minimap asked for 1,000 slabs at once, the CPU got overwhelmed, the kitchen caught fire, and the whole building had to be evacuated.

The Solution:
We told the CPU to make a "North," "South," "East," and "West" slab just once and put them in cach. Now, when the Minimap asks for a slab, the CPU just grabs the finished one off the shelf. No more fire.

Basically, we bought stability with memory.