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This change introduces a "compileOutputSet" step which is executed as part of collecting the rules. In this step, each rule only receives as possible outputs the output indexes that are non-empty for the region of that rule.
This makes it much easier to add output variation to only some of the rules. Previously, due to the possibility of empty outputs being chosen, having rules with various amounts of variation required setting up separate rule maps.
Closes #3523
This PR supercedes #3894, which was merged accidentally.