The embed section has been removed in order to simplify this screen.
It was added to make easier include content coming from h5p.org but,
as soon users won't be able to use it, it makes no sense.
Users will still be able to use the "HTML" button to paste the
embed code.
A new plugintype has been created for having more than one installed
third-party H5P libraries. Existing libraries have been moved from
lib/h5p to the new h5plib_v124 plugin.