Shadow Generator

I Did Try This In A Game, But It Doesn't Quite Work For Objects Of Massive Scale That Don't Have A Flat Bottom. Like, Completely Straight Throughout The Icon.

First off, nice library, excellent way to go about making shadows, and from what I can tell, its a good implementation. There are a few things I changed with how I'm using it: I set the appearance, color, and alpha vars of the shadow in it's New() proc, passed the atom through to it. Also, instead of having 3 variants of shadow I'm going to be linking it to the day cycle of my game to update the shadow every in game hour, so I'll be doing some math based on that to calculate the position of the shadow.

Second, for those of you trying to use this, if you want to call it in atom/movable/New or obj/New.. do a sanity check to make sure you're not also calling it for /shadow types, as they inherit obj's (and by extension /atom/movable's) behavior. It was infinitely generating shadows for shadows and it lagged hardcore for me, I was thinking I wouldnt be able to use this but thankfully my debugging skills showed me the problem.

tl;dr make sure you don't generate shadows for shadows

Noticed an issue. Whenever you save the game with the shadow currently on a mob (not sure with turfs), and you reload into the world, the shadow system duplicates your player icon and shadow.