Firepit

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- Added query.BinnedColumn so you can group by time buckets

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- Better STIX extension property support
- Add a new `__columns` "private" table to store mapping from object path to column name
- New path/prop metadata functions to supply metadata about STIX properties
- Improved STIX ``process`` "deterministic" ``id`` generation
- Use a unique ID from extension properties, if found
- Use related ``x-oca-asset`` hostname or ID if available

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- Add ``splint convert`` command to convert some logs files to STIX
bundles

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- Use a "normalized" SQL database
- Initial STIX 2.1 support

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New assign_query API, minor query API improvements

- new way to create views via assign_query
- can now init a Query with a list instead of calling append
- Some SQL injection protection in query classes

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* Better support for grouped data