Create/Update assets for version 1.17-pre4

data/minecraft/structures/village/snowy/zombie/_list.json

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+{"directories":["houses","streets","town_centers","villagers"],"files":[]}

data/minecraft/structures/village/snowy/zombie/houses/_list.json

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+{"directories":[],"files":["snowy_medium_house_1.nbt","snowy_medium_house_2.nbt","snowy_medium_house_3.nbt","snowy_small_house_1.nbt","snowy_small_house_2.nbt","snowy_small_house_3.nbt","snowy_small_house_4.nbt","snowy_small_house_5.nbt","snowy_small_house_6.nbt","snowy_small_house_7.nbt","snowy_small_house_8.nbt"]}

data/minecraft/structures/village/snowy/zombie/streets/_list.json

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+{"directories":[],"files":["corner_01.nbt","corner_02.nbt","corner_03.nbt","crossroad_01.nbt","crossroad_02.nbt","crossroad_03.nbt","crossroad_04.nbt","crossroad_05.nbt","crossroad_06.nbt","square_01.nbt","straight_01.nbt","straight_02.nbt","straight_03.nbt","straight_04.nbt","straight_06.nbt","straight_08.nbt","turn_01.nbt"]}

data/minecraft/structures/village/snowy/zombie/town_centers/_list.json

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+{"directories":[],"files":["snowy_meeting_point_1.nbt","snowy_meeting_point_2.nbt","snowy_meeting_point_3.nbt"]}

data/minecraft/structures/village/snowy/zombie/villagers/_list.json

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+{"directories":[],"files":["nitwit.nbt","unemployed.nbt"]}