v5.46.3 Rebirth Adjustment, Security Fix

API

• Feature: Simplify logic for awarding Orb of Rebirth achievements. It's no longer necessary to exceed previous level to stack the achievement, only to grow the "highest level rebirthed" portion (@Hafizzle)
• Fix: Generate fresh IV for cryptography instead of using a static environment variable. Addresses GHSA-wj5m-v567-ph9j (Corban Villa)