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minor

Further cleanup and rename new default cache strategy to default cache strategy #5833

Remove all old reference cache strategies completely #5833

Further clean up reference cache strategies #5833

Some further cleaning up for single reference cache strategy #5833

Implement single cache strategy for references #5833

• Implemented new class NewDefaultReferenceCacheStrategy and helper class TitleWithoutYearAndAuthorHelper
• Moved all functionality of old ReferenceCacheStrategies to new class(es)
• Moved all old strategies to package .old...

smaller changes in TaxonNode

Implement isOrphaned() #5824

Synonym counts as orphaned if all of the accepted taxa are orphaned