add ability to export saved list

[cch5ng]

this is kind of a workaround measure... b/c in the future it is quite plausible the user might have saved list, but if the original markdown file changes, then the references to deprecated questions might cause issues (etc)

diff logic (saved questions vs new questions vs deprecated questions) will be fairly complex I think, so an interim solution would be to be able to export the list to text or something you could print/view in web