Before this change, only three hardcoded oEmbed endpoints were available
for users of the extension; youtube, flickr and vimeo. In the
configuration, it was only possible to pass a subset of those 3 oEmbed
endpoints. It was done by passing the names of the allowed endpoints.
With this change, the API has changed. The allowed_endpoints kwarg now
expects to be passed a list of OEmbedEndpoint objects (as opposed to
names). This means the responsibility of creating OEmbedEndpoint objects
has been shifted to the user of the extension. If the allowed_endpoints
kwarg is omitted, the default oEmbed endpoints used will be the same as
before; youtube, flickr and vimeo.
The motivation is to allow arbitrary oEmbed endpoints, without
necessitating anyone to maintain the list of all possible oEmbed
endpoints out there.
