Draft: macos: Drag and drop support
This MR adds DnD to macOS. It also contains some work @chergert already did earlier last year.
Although DnD works, and does not seem to crash, there's one caveat: while a DnD action is preformed, the application window is frozen. I haven't figured out how to fix that.
Fixes #3423 (closed).
Edited by Arjan Molenaar