"is_case_sensitive" attribute

[mghenderson]

So I'm seeing a boolean attribute on various elements, is_case_sensitive, which I found a couple places in the STIX documentation, but this is the best example (found near the bottom).

@ChrisStrasburg Do we want/need to add support for this element? It's valid STIX, so I'm leaning towards yes, but I'm doubtful that anyone is actually processing the attribute.

FlexT Warning Examples

FlexTransform.SchemaParser (/Users/mhend/git/FlexTransform/FlexTransform/SchemaParser/SchemaParser.py:538) WARNING:observable;object;properties;value;is_case_sensitive not processed for row type IndicatorData in schema config. Value: False
FlexTransform.SchemaParser (/Users/mhend/git/FlexTransform/FlexTransform/SchemaParser/SchemaParser.py:538) WARNING:observable;object;properties;address_value;is_case_sensitive not processed for row type IndicatorData in schema config. Value: False
FlexTransform.SchemaParser (/Users/mhend/git/FlexTransform/FlexTransform/SchemaParser/SchemaParser.py:538) WARNING:information_source;contributing_sources;sources not processed for row type DocumentHeaderData in schema config. Value: [{'tools': [{}], 'identity': {'xsi:type': 'ciqIdentity:CIQIdentity3.0InstanceType', 'specification': {'addresses': [{'country': {'name_elements': [{}]}, 'administrative_area': {'name_elements': [{}]}}], 'party_name': {'organisation_names': [{'name_elements': [{'value': 'usa.gov'}]}]}}}}]

Line examples from file (out of context)

<DomainNameObj:Value apply_condition="ANY" condition="Equals" is_case_sensitive="false">[BAD DOMAIN]</DomainNameObj:Value>
<AddressObj:Address_Value apply_condition="ANY" condition="Equals" is_case_sensitive="false">[BAD IP]</AddressObj:Address_Value>