Llama Steeds

Updated to support Minecraft Forge 1.17.1 since Mixins have been updated for it (and a new Mixin wiki page on using it with Forge exists now)

Changelog

• Updated to use Java 16
• Supports Minecraft 1.17.1+
• Supports Minecraft Forge 37.0.59+
• Switched to official mappings
• Bump version to 2021.11.20
• Includes proper mixin configuration in build.gradle and now generates a refmap
• Changed mods.toml line ending from \r\n to \n to fix strange character in extended description