Issue503 pull Request

Added MetaRotation Mirror for most blocks including Furnaces, Hoppers, ladders, levers, pumpkins, rails, repeaters, slabs, and trapdoors.

Files not supported at the moment are MobHeads, Pistons, and signs.  Why?  Mob heads and signs use tile entity data and I need to do a bit of extra research on that.  Pistons are just glitchy and I have no idea why.

Those are minor things that take a disproportionately large effort to implement, so I'm leaving that for my next pull request.