Suggest we add full formatting of selected text

[rohrlich]

We already have Go formatting when you save but I'd like to call it on selected text. For me this could just replace "Indent" when I coding Go but I suspect that Indent is a good feature for other file types.

[rcoreilly]

I don't think the gofmt tool works on isolated text as it tries to compile the whole thing.. but could investigate this -- maybe it does work. otherwise we'd have to use our parsed tree to regenerate code which is possible but not trivial..

[rohrlich]

Yeah, only if easy.