Emergency Save Detection on Start

Migrated from https://bugs.launchpad.net/inkscape/+bug/1810112

When Inkscape crashes and an emergency save file is created, and the next start up it would be Nice if Inkscape said something like, "Emergency Save File Found, would you like to recover?" Then offer to open the document, like some Office programs do with word processing files.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information