Add class method to szengineflags to reverse a flags int value into the names of the enum definitions

[antaenc]

Example, convert 3734464 (SzEngineFlags.SZ_ENTITY_DEFAULT_FLAGS) to:

['SZ_ENTITY_INCLUDE_POSSIBLY_SAME_RELATIONS',
 'SZ_ENTITY_INCLUDE_POSSIBLY_RELATED_RELATIONS',
 'SZ_ENTITY_INCLUDE_NAME_ONLY_RELATIONS',
 'SZ_ENTITY_INCLUDE_DISCLOSED_RELATIONS',
 'SZ_ENTITY_INCLUDE_REPRESENTATIVE_FEATURES',
 'SZ_ENTITY_INCLUDE_ENTITY_NAME',
 'SZ_ENTITY_INCLUDE_RECORD_SUMMARY',
 'SZ_ENTITY_INCLUDE_RECORD_DATA',
 'SZ_ENTITY_INCLUDE_RECORD_MATCHING_INFO',
 'SZ_ENTITY_INCLUDE_RELATED_ENTITY_NAME',
 'SZ_ENTITY_INCLUDE_RELATED_MATCHING_INFO',
 'SZ_ENTITY_INCLUDE_RELATED_RECORD_SUMMARY']

[antaenc]

Going to revisit in the future, hit some snags and additional possibilities to improve this. Need to rethink an improved approach to a single dictionary structure that includes this information when requesting flag details by name or value.