Respackopts

Commits in Release 4.9.0:

• chore: bump to 1.20.6
• feat: introduce validation layer to detect early resource loads and infinite recursion
• fix: move validation layer under debugLogs option that already exists for things like that
• chore: mention additional incompatible mods in FMJ
• chore: remove dashloader compat
• fix: use different log category for IO logs
• chore: clean up logging
• feat: rewrite pack discovery and add warnings for duplicate IDs
• chore: optimize imports
• fix: properly account for MetaCache mutation when removing old keys
• fix: avoid expensive tree equality computation when comparing pack states
• fix: don't clear cache prematurely when there are multiple pack managers