This is a small change aimed at helping downstream modularity.
Currently the file these sprites use are hardcoded with a define, this removes that and instead moves it to a var.
I guess the thing is defaults should be overridable, it's just we've never ran into a case where it's needed, so adding that functionality on its own looks really weird
annoying. I don't like adding stuff that's only useful to downstreams, for various reasons, but this seems ok after some thought. fulfills the promise of _DEFAULT.
-Lemon
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