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Draft: Allow for an empty device list during add

Peter Hutterer requested to merge whot/udev-hid-bpf:wip/bpf-only-arg into main

This allows for udev-hid-bpf add - path/to/bpf.o [...] at which point we inspect the given BPFs, resolve those to BUS:VID:PID prefixes based on the HID_DEVICE entries and simply resolve those prefixes to any device in /sys/bus/hid/devices/BUS:VID:PID.*.

Especially during development this makes life easier as the sysfs paths can change as devices are unplugged/bpfs are loaded so letting udev-hid-bpf do all the hard work makes life easier.

Closes #40

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