Having mixed $data in badge exporters is causing some issues.
As all these exporters are using $data as an object, $data can be
converted to object in the constructor, to avoid errors and get
the expected behaviour always.
Upgrade the support for Open Badges 2 to support a real open badges 2 backpack.
Moodle can only talk to one backpack at a time, so after switching backpacks, users
will have to manually disconnect and then reconnect their backpack to the new one.
This commit combines several changes:
* Split classes into badges namespace
* Publish expiry data with a badge
* Publish badge alignments in badges exported to the backpack.
* Export the criteria for a badge to the backpack.
Sara Arjona