[bd] API for XenForo 2.0 2.2.0 Beta 1

Changes:

• Add support for GET `/threads/:id/navigation`
• Add support for POST `/search/resources`
• Add support for `Api-Bb-Code-Chr` header
• Allow POST `/search/xxx` to handle `user_id` only request
• Include `forum` in thread data
• Include stickied threads on top of the GET /threads?forum_id=xxx
• Include required externals in bb code HTML
• Restore missing attachment fields: attachment_height, attachment_is_inserted, attachment_width
• Include `content_type` and `content_id` in prepared search result data
• Fix attachment `src` being rendered in html
• Fix batch job exception shorts circuit the entire batch
• Initialize `api.server` early to avoid conflict with XLink add-on
• Update `leage/oauth2-server@4.1.7` to fix `Authorization` header check