v0.10 Support for shutdown scripts

With the push from @piepie62 through a pull request I've reworked the application to also run scripts on shutdown, if there are no scripts in that folder it will terminate as usual.

This was done while I was supposed to work on other things, I have too many projects ongoing, so if you experience any problems make sure to report them in issues here. I'm using this myself so I'll be actively testing it too.