AI Engine Pro 2.6.8

* Add: Support for [GPT-4o mini](https://openai.com/index/gpt-4o-mini-advancing-cost-efficient-intelligence/).
* Add: Support for HTML Blocks and Shortcuts (Quick Actions) via MwaiAPI in JS and PHP filters.
* Fix: Better handling of documents, annotations and images created via the OpenAI Assistants.
* Fix: Better CSS for the buttons and the scroll in the chatbot.
* Fix: The MwaiAPI was registering the chatbots twice, and now works in the admin as well.
* Fix: Input Max Length was not handled properly in the chatbot (UTF-8 related).

* Add: A first implementation of actions and blocks for the chatbot. Actions in JS are also handled. Please note that documentation will come later, this is for internal testing for now.
* Update: The chatId is now returned by simpleChatbotQuery.
* Update: Streamlined the naming of a few functions and filters related to the Statistics Module.
* Fix: Minor fixes, such as the button in Timeless.
* Fix: Three minor security issues (simpleVisionQuery SSRF, logs file as a PHP file, SQL injection via sort parameter). Those attacks could only be performed by, actually, an admin.

* Update: New system for the avatars used in the chatbot. You can set different avatars for the icon, the AI, the guest. Emoticons are also supported.
* Update: Improved the Timeless theme.
* Update: Improved the way the nonce is handled.
* Update: Streamlined the way function calling works.
* Update: Modified default avatars.
* Update: The JS filter ai.reply now returns the chatId and botId as well.
* Fix: Minor issues.