ModernFix

Depending on the size of this release, there may be a human-readable changelog available on the wiki page.

Changes since 5.9.0+1.16.5

• Fix path replacements being too aggressive - embeddedt
• Warn if keySet is used by a mod when dynamic resources is on - embeddedt
• Revert "Use copy-on-write map for permanent overrides" - embeddedt
• Use copy-on-write map for permanent overrides - embeddedt