macOS: dragging to trash != uninstall

[jagerman]

Mac users have been trained by Apple to drag something to the trash to uninstall the app.

However Mac users don't allow the app (AFAIK) to hook into that to actually uninstall properly, because why would anyone need something as crazy as that?

This is particularly problematic because trashing it can leave Lokinet running, including leaving the DNS settings in place, and so some users have reported getting stuck with a mac that can't resolve anything after trying to uninstall.

So either:

1. I'm wrong and we can hook it and properly uninstall when you drag to the trash (and need to implement that), or
2. We need a hack for this hacky broken OS.

[neuroscr]

The common thing is to have a Lokinet folder in /Applications and include a uninstall app there

[majestrate]

related to #1528