Wagtail-transfer

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* Fix missing source when importing objects (Kalob Taulien)
* Fix updated request.site to use Site.find_for_request() (Kalob Taulien)

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* Add support for transferring snippet models (Kalob Taulien)

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* Fix missing mappings to parent IDs in the export API for tree-based models
* Fix handling of null RichTextFields (Kalob Taulien)

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* Fix error when exporting empty non-required ChooserBlocks (Kalob Taulien, Jacob Topp-Mugglestone)
* Fix handling of embeds in rich text (Kalob Taulien, Jacob Topp-Mugglestone)
* Ensure that file URLs are always absolute by falling back on BASE_URL when MEDIA_URL is local (Kalob Taulinen)

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* Add preseed_transfer_table management command
* Django 3.0 compatibility (Kalob Taulien)
* Fix handling of FileFields with non-callable upload_to parameters
* Pre-select source site if there is only one option

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* Initial release