feat/recommendation: wrap launch agents and daemons in named files

[tmillr]

This isn't a bug nor anything super important, but it would be nicer if agents and daemons were wrapped into appropriately named files/executables. With the current setup (i.e. just using sh in ProgramArguments), you end up with something like this in the System Settings > Login Items pane:

and furthermore, clicking on the info icon takes you to the sh executable (which isn't very useful: this tells me nothing about which executables/commands are actually invoked and it's hard to determine which is which).

To remedy this, it would probably be necessary to wrap most of the existing agents with perhaps the exception of executables which are already self-explanatory (e.g. gpg-connect-agent). It seems macOS just uses the name/path of the executable here (ignoring the name of the plist, the label defined within the plist, as well as any shebangs the executable file might have).