EventFormat, EventStreamInfo, and FileMetaData: Implement common interface for specifying keys to copy
requested to merge berghaus/athena:EventFormat_EventStreamInfo_and_FileMetaData_Input_Keys into master
The metadata tools for EventStreamInfo, EventFormat, and FileMetaData now all have a property called "Keys". This property may be used to specify a list of keys to propagate from the InputMetaDataStore to the MetaDataStore. If the property is not set or empty, all keys will be copied.