CodeBadger: Skillsmith x Iron's Spells

1.0.0-1.21.1

• Needs CodeBadger: Skillsmith 1.0.0-1.21.1 or newer.
• Adds config/skillsmith/readmes/codebadger_skillsmith_irons_spells.md, explaining what the addon adds and which of its files does what. Skillsmith keeps it up to date with the addon.
• The scroll forge's rarity lock now shows where you can see it: the scroll in the result slot shows what its rarity needs in its tooltip (before, every scroll showed Intelligence 10), and clicking a locked one shows "Requires ..." above the forge, using Skillsmith's new messages over open screens.
• Scrolls no longer have a crafting lock of their own; the scroll forge's rarity lock covers them.
• The arcane anvil's Intelligence XP now uses Skillsmith's own workstation XP. It pays the same. If you installed an earlier beta, delete config/skillsmith/xp_sources/irons_spellbooks.json so the new one is copied in; until then, the arcane anvil gives no XP.