Pass allowed page types into page chooser #277
Merged
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Fixes #267
Some page choosers have limited page types which could be defined either by the foreign key being set to a specific page type or a list of allowed page types on the PageChooserPanel/Block.
This adds support for finding this information from the panel/block and passing it into the widget on the frontend.
While implementing this, I discovered an inconsistency with the way we're extracting related page segments from streamfield. On the model, these are extracted as overridable segments, but in streamfield they were being extracted as a translatable related object segment. This PR fixes that as well.