Add info bar with option to cancel

[GrahamTheCoder]

Is your feature request related to a problem? Please describe. Having no obvious way to cancel is frustrating if you click the wrong project Workaround: Convert another small file to cancel the current conversion

Describe the solution you'd like Use an info bar like: https://github.com/onlyutkarsh/InfoBarDemo Could also include a progress bar, a link to the wiki, etc.

Describe alternatives you've considered Blocking the UI using the VsTask UI - I don't like blocking the UI unnecessarily