Preview on new File manager

[beezot]

With OctoPrint integrating a file manager with version 1.11, it would be nice to also have the preview option on that page.

[jneilliii]

Yeah, I was planning on adding it hopefully, just busy with work the next couple of weeks so haven't had time to look at the new interface yet.

[jneilliii]

About to be released with version 1.1.0.