This is for use in Tailgunner... an X/Y/Z coordinate in the range -1024:1023 can be packed into a single Scratch integer, which makes it a lot easier to pass 3D points around internally... This uses 44 bits. I could easily extend the coordinate range to -2048:2047 by using 48 bits. Games like this were originally implemented in fixed point and a truncated range like this for world coordinates is quite reasonable.
Could be speeded up a little if needed. We'll see how this goes first with the 'obvious' implementation. (This container performs a quick regression test just to check that the code is still working in case it is tweaked...) Extract via backpack.
