This PR updates the filps/whoops dependency to 1.0.1, which includes among other small fixes a feature to enable opening files referenced in the error page in the user's editor/IDE of choice. Required changes to templates & CSS were also ported.

Currently, the feature will not be visible, as no editor is set by default. I've decided against making the choice to structure that myself. My idea was to add another option to app/config/app.php named editor or some such, but there's probably room to allow machine-specific editor choices, loading from environment variables, etc.

Setting an editor is simple:

1. Check the available editors in PrettyPageHandler
2. Use PrettyPageHandler::setEditor( string $identifier ) to set an editor by identifier
3. Alternatively, pass a callable to setEditor that accepts a file path and a line number, and returns a string usable as an href property
4. Alternatively, add your own editor options with PrettyPageHandler::addEditor(string $identifier, callable)

Finally, @daylerees might want to have a look at my changes to the template and CSS, and tweak them to fit his choices - my solution is far from perfect 😅

Additional info is available in the whoops repo.

Cheers!