- Resolve holds on return from diagram preview - Generic improvements

1. Add support for Open AI models: - gpt-4o-mini - add gpt-4.1-mini (vision) 2. Make AI call contrained with json schema 3. stability improvements

- adds offline detection - improve diagram editor

- add support for detecting use-case diagrams from drawing - generic fix and improvements

- The deprecated model `gpt-4-vision-preview` has been replaced by `gpt-4o`. - Generic improvement including a better dark mode management.

Excited new AI feature that allow to generate PlantUML script from hand drawn diagram either with pencil or fingers, let try it to believe how it is powerful and handy

- Move out from deprecation OpenAI API change from "Edit Model" to "Chat Completion" using model gpt-3.5-turbo or gpt-4 - remove useless edit button - fix issue on diagram's rendering after get AI result - generic improvement

From this version has been completely replaced the editor using one of a best-of-breed text editor available "Ace" (https://ace.c9.io), that enable both syntax highlighting and snippets auto completion. Take a note that, from this release, the PlantUML Custom Keyboard has been disabled because not compatible with the new editor.

In this version there is a possibility to choose AI model between "text-davinci-edit-001" and, "code-davinci-edit-001"

AI capability through OpenAI integration > You must have a valid [OpenAI] api key to use this feature * Prompt your diagram request in natural language * Undo Prompt * Prompt's History

- update toolbar layout - general improvement

- Line Text Editor improvement: allowing to customise editing behaviours. This is for future features related to inline editing enhancements - Custom Keyboard improvement: new "Choice Key" allowing to present a choices list for selecting preferred command to write

fix to fully support dark mode

* Auto save over modification * Color key > Open a color picker for choosing the color to apply