Complete Amber v11 parity work

[iamkaf]

Summary

• complete Amber v11 parity work for fishing catch modification and structure lookup APIs
• polish the v11 changelog for user-facing mod release notes
• move Amber onto convention plugins 2.0.1 and add just publish-all for Kaf Maven publishing

Verification

• just build-all passed after publishing multiloader-conventions 2.0.1 to Maven Local for local plugin resolution
• Amber build result: BUILD SUCCESSFUL in 37s, 1793 actionable tasks

Notes

• A clean machine needs multiloader-conventions 2.0.1 available from Kaf Maven before building Amber with project.plugins=2.0.1.