Having to update the plugins to add a submenu in the context menu,
it's more cost-effective to remove support for legacy macOS versions
than implementing and testing this setup.
This uses the new official API to show overlay icons and add our
custom context menu entry instead of hooking directly into the
Finder process and intercept drawind routines.
A dummy desktopclient target is also in the project to allow debugging
directly in Xcode while the official client can be started from the
command line. Otherwise Xcode won't allow attaching to the debugee.
Dummy icon files have been added while we get proper icon produced.
We can't use the old icons since what we use for the legacy shell
integration is already padded according to where the badge should
appear on the full icon.
