Release Metafacture core 6.0.0

[dr0i]

Follows up #502.

Bump up major version, see #513 (review).

• update dependencies if these are promising to not break much (nothing this time)
• test release candidate
• release on maven central
• release on github
• Release metafacture-fix 1.0.0
• update flux-commands
• Release metafacture-playground 1.0.0
• copy metafacture-fix' functions-and-cookbook to metafacture-documentation/Fix-function-and-Cookbook.md
• write blog post, see PR
• toot
• write to email list
• announce at metadaten.community

[dr0i]

Decided to test if the java version 11 is ok with our apps. If so we make this release with java 11.
See #518.

[dr0i]

Based on this PR is the sonatype SNAPSHOT release 6.0.0-rc1-SNAPSHOT and github packages 6.0.0-rc1-SNAPSHOT . See wiki/Maintainer-Guideline how to use it. Please test it and check mark:

• lobid-resources
• limetrans
• fix
• playground

[blackwinter]

fix:

Incompatible because this component declares a component, compatible with Java 11 and the consumer needed a component, compatible with Java 8

Depends on metafacture/metafacture-fix#343.