Implement udev rule installer

[nickray]

Maybe https://github.com/solokeys/solo/issues/144 will roll out quickly, but separately it would be great to have a command

solo install-udev-rules

or similar that

• checks if we're on Linux
• optionally: checks if udev rule for VID/PID is already installed
• checks udev version:
  • installs https://github.com/solokeys/solo/blob/master/udev/70-solokeys-access.rules if udev is recent
  • otherwise falls back on https://github.com/solokeys/solo/blob/master/udev/70-solokeys-legacy-access.rules
• activates the rule

This can already be done today with a Makefile

This should be implemented as a library function or functions, that the CLI calls.

[nickray]

This may no longer be necessary:

• we're in https://github.com/Yubico/libu2f-host/releases/tag/libu2f-host-1.1.10 \o/
• Arch Linux has this already, hopefully Debian and Ubuntu soon
• Fedora solves the problem differently (detecting HID FIDO usage page)