Flesh2Leather v1.0.0

Added

• Rotten flesh to leather furnace recipe, with smoker support from Java 1.14.
• Ten legacy packs for Java 1.13 through 1.20.1 and a ranged pack for 1.20.2 through 26.3.
• Reproducible builds, recipe and archive validation, SHA-256 checksums, and an all-versions bundle.
• Continuous integration and tagged GitHub releases.
• Shared Flesh2Leather project icon, included as pack.png in every datapack ZIP.

Fixed

• Use the unnamespaced smelting recipe type required by Minecraft 1.13.
• Validate the 1.13 serializer separately from 1.14, which shares pack format 4.