New MINOR release 03.21.00 Changes since 03.20.00: - feat: lmap fanout plugin - feat(lmap): Convenience plugins for system tags - fix: Do noting in CopyRegisterDecorator::doPreRead - fix: exception handling from ReadAnyGroup::accept - fix: compiler error on clang - feat: add user type as value type - chore: add C++ concepts - test: versionNum after exception within readAny