New wish in Brackets, open file ICO

[Denisov21]

I thought the ability to view a preview of the ICO file in a similar way as it does for JPG files in Brackets. In the preview window I'd like to appear the maximum size in pixels x pixels and the file size. I know that the ICO file can contain multiple files inside it, but I only want to see the bigger picture, the end is only a preview.

[peterflynn]

Closing -- dupe of #7017