Terra-layer

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Fixes

* Handle group selectors and settings in tree

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Improves

* Add tree edition support via Scene API
* Can now have geolayers at tree root
* Geolayers and groups can be mixed in any order

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* Support python 3.8, django 3.0 and DRF 3.11
* Improve ordering and filters
* Drop requirement over url-filter

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Improves

* Update code documentation
* Allow layer ordering by view name
* Allow layer search by name and settings
* Allow layer filter by source

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Fixes

* Custom styles must be anonymized on exports to be importables

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Fixes

* Fixes some layer's export/import mistakes