BuddyPress Groups avatar & cover endpoints for JSON API User Plus via REST calls

Four new endpoints have been added in the JSON API User Plus plugin for BuddyPress Groups component REST JSON API groups_get_avatar, groups_upload_avatar, groups_get_cover, groups_upload_cover. These endpoints have added missing features for the BuddyPress Groups component via REST API and now Groups endpoints can be used for mobile app to manage avatars and cover. Both Update…