Firmament for Hypixel SkyBlock

Full Changelog: https://github.com/nea89o/Firmament/compare/1.5.0...1.6.0

• Bump to 1.20.6
• Fix firmament keybindings category name
• Add remove command to waypoints
• Fix wrapping with ordered waypoints
• Add skipping ordered waypoints
• Make inventory buttons draggable in editor
• Add custom global textures
• Add item predicate
• Make firmament predicates fall back to not matching
• Add extra attribute item predicate
• Improve line renderer
• Fix crash for buggy-ish repo items
• Fix item rarity not displaying in npc shops
• Add armor texture overrides
• [WIP] Add mod api
• Fix some items preventing the storage overlay from saving
• Speed up scrolling in settings GUI