Add option to disable Whats new in the VSCode Extension

[dougg0k]

It's currently forcefully appearing everytime there is a new version (changelog).

An option to disable that through config would be cool, and a button on the same UI.

[tyt2y3]

Sure, I get you.

[dougg0k]

Still appearing a window everytime, mostly with rustc changes in changelog.

Does not seem relevant.

[tyt2y3]

sorry, it does, but it happens only once per update

[dougg0k]

Yeah, will just keep it disabled by default and enable per project.