MVS - Moog's Voyager Structure (config pack)

Fixed

• Fixed crash when generating any of the new houses on 1.20.1 (diorite_and_deepslate_house, mud_brick_house_1, prismarine_house_1) - their sign block entities had bare empty messages list entries that the 1.20.1 sign codec parses as null, causing an NPE during chunk feature placement (#85)
• Converted written book items in mud_brick_house_1 and lecturn_garden from the 1.20.5+ components schema to the legacy tag schema so their pages, title, and author actually load on 1.20.x
• Converted entity attributes list on strays, guardians, drowned, and the small_ship villager to the legacy Attributes schema so their custom health/speed/follow-range no longer silently drop on 1.20.x
• Stripped 1.21.5+ fall_distance float from mobs in prismarine_house_2 and ocean_tower (silently ignored pre-1.21.5)
• Fixed horse jump strength attribute id on horse_pen