VSCode extension for SA developers

[iqnite]

Make Scratch Addon's development even faster by creating an extension for Visual Studio Code. That extension would have the following features:

• Add syntax highlight and autocomplete support for Scratch Addons keywords (like addon.tab)
• Quickly set up addon folders (like what create-sa-addon does)
• GUI for editing addon.json manifest files, which would be like a form with parameters to fill in (name, version added, credits, ...)
• Automatically link an addon's folder in the addons.json file when a new manifest file is created
• Show the equivalent Scratch block for JavaScript commands (and vice-versa)?

I'm aware that this very probably will not be accepted, but maybe it will serve as an inspiration to someone.

[CST1229]

Don't forget quickly creating addons (like what create-sa-addon does).

[Samq64]

Related: #3968

[WorldLanguages]

Related: Our project has a lot of subfolders, it would be nice to provide a way to hide all other addon folders except the one that is currently under development.

[iqnite]

Related: Our project has a lot of subfolders, it would be nice to provide a way to hide all other addon folders except the one that is currently under development.

Adding a way to create folders in the "Open editors" panel would be good enough. That would make the extension useful even for non-SA-devs!

[WorldLanguages]

Related: #6440