Clld

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- Don't load resources from CDN anymore.
- Re-instate per-DataTable configurable download links.
- Support for creating localized URLs.

~~~~~

- Dropped support for py3.6.
- Removed per-table download buttons.

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- Fixed confusing table info.
- Added case-sensitive column search function.

~~~~~

Fixed bug where person pre/suffixes for unknown gloss abbreviations would be
dropped when rendering IGTs.

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Fixed bug where resize cursor would not show for map resizer with Leaflet 1.7.

Backwards incompatible removals:

- remove mostly useless adapters
- removed functionality to initialize db objects from csv
- removed deprecated purl property
- drop support for pg_collkey
- removed unneeded deps and unused functionality for combining geojson from other clld apps

~~~~~

- deprecate `ClldRequest.purl` in preparation of removing `purl` as dependency
- require `SQLAlchemy>=1.4`