[PDI-9289] Meta-injection enabled for Excel Writer output fields.
Merge pull request #870 from gretchiemoran/master

[PDI-9289] Meta-injection enabled for Excel Writer output fields.
PDI-12893 - JUnit test.
PDI-12893 - Exception in thread "main" java.util.ConcurrentModificationException
Merge pull request #871 from YuryBY/PDI-12893

[PDI-12893] - Exception in thread "main" java.util.ConcurrentModificationException
Named configuration API
[BACKLOG-974] Configuration objects and API updated
Adding persistence and minor amounts of UI for named configurations