Feature Request: Wake-on-LAN transmission capability

[jrwarwick]

If response comes back failed, and name is resolvable (or it was already just an IP address) and that IP address is on the same subnet as Mycroft, and Mycroft has a cached MAC address for the requested host, then generate a WoL/Magic Packet and ask the user "Shall I attempt to send a wake-on-LAN signal?" and if user affirms, then transmit.

Correlated feature: create a simple key/value text cache. At the end of every successful ping, lookup and cache the MAC address.

Possibly after sending WoL packet, offer to retry ping. Maybe at 20 seconds, 1 minute, 3 minutes, then give up (and issuing an utterance to that effect).