Wither Skeleton Archers in Fortresses

Using commands, wither skeletons are capable of wielding bows, and even inflict fire damage on a hit with them. This datapack/server-side mod replaces the skeletons that spawn in nether fortresses with such wither skeletons, making these structures more difficult. __Regular sword-wielding wither skeletons are unaffected.__ **Original:** The [original datapack](https://www.planetminecraft.com/data-pack/wither-skeleton-archers-in-nether-fortresses/) my datapack is based off of was abandoned three years ago, and performs the replacement whenever a skeleton spawns in the nether on nether bricks (or related blocks). It also wouldn't work in newer versions, as it did this nether check using `Dimension:-1` instead of the newer format `Dimension:the_nether`. My datapack instead uses a predicate to detect whether a skeleton is in a nether fortress. **Versions:** The only differences between the legacy version (1.15 - 1.18.2), the 1.19.x version (1.19 - 1.19.4), and the modern version (1.20+) are syntax-based in the code; each one works the same way. This is necessary because the `feature` field in `location` predicates was renamed to `structure` in 1.19.3, and the `alternative` predicate type was renamed to `any_of` in 1.20. **Mod Compatibility:** It is currently impossible to detect whether an entity is in any structure that has a given tag, so instead I used `any_of`/`alternative` to allow for modded fortresses, such as: - Apocalyptic Fortress (`hexfortress:nether_fortress`) - Dungeons and Taverns (`minecraft:nether_keep`) - YUNG's Better Fortresses (`betterfortresses:fortress`) This mod is also compatible with any fortress mod that keeps the `minecraft:fortress` namespace. If you have a modded structure that isn't on this list that you'd like this datapack to be compatible with, you can edit the file `data/wsaif/predicates/in_fortress.json` and follow the format there to add it. **Uninstalling:** This datapack is safe to remove from your world, but doing so won't revert any existing wither skeleton archers back to skeletons.