AI Engine Pro 2.6.8

* Add: Support for Function and Tools Calls with OpenAI and Claude, with back-and-forth feedback loop. Models can now get values to functions in you WordPress. The Pro Version of AI Engine also connects to [Snippet Vault](https://wordpress.org/plugins/snippet-vault/) to make this much easier.
* Update: The WooCommerce Assistant has been moved to [SEO Engine](https://wordpress.org/plugins/seo-engine/). We shouldn't bloat AI Engine with features related to SEO.
* Fix: Copilot wasn't working with the latest version of WP.
* Fix: Arbitrary File Upload security issue.
* Fix: Fixes and enhancements in the AI Forms.

* Add: The chatbot displays the uploaded images.
* Update: More elegant refresh of the embeddings.
* Update: If functions are added to query, but the models don't support it, they will be removed rather than causing an error on the API side (an error will be logged).
* Fix: Issues related to the arguments order in chat_submit.

* Update: Cleaner handling of tokens and prices.
* Update: Enhanced the way mime types are handled, that fixes issues with Claude Vision.
* Fix: There was an issue with Max Messages with Claude.