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95b6d5e803
This enables us to automatically create configuration formats from enums or structs. For enums, we create a structure with a field for each case, representing a pattern match; the configuration format can then enter a different expression for each case. For structs, we create an enum with a variant for each field, representing projecting by that field; the configuration format selects the field to project from, and then can write a further expression on that field (for instance, it can perform another pattern match). So far we don't actually have anything that *uses* this functionality; I decided to finish it for the purpose of specifying a default lantern offset, only to discover that we already return a lantern offset from the animation crate. So I fixed it there instead.