Reveal: Index & Codex

Initial release.

• Added the Reveal Codex, a two-slot interface for unlocking records through configured materials.
• Added the Index Book, a shareable book for browsing and carrying discovered records.
• Added page-style record reading UI with multi-page support.
• Added configurable reveal recipes with one-item and two-item inputs.
• Added weighted random record unlocking.
• Added built-in vanilla-related records.
• Added record sharing and merging through Index Books.
• Added player progress storage and synchronization with Index Books.
• Added optional record page item support.
• Added optional JEI recipe display support.