Allow device to route between internet and LoRa

[texrg]

I think, many people need a router version. With ethernet cable.
Increase network and comunicating from/to internet
For example tox, matrix, wire <-> to lora

[geeksville]

oh yes, this is definitely a good idea, though given the limited bandwidth of LoRa I think the existing bluetooth (or serial via USB) link is probably sufficient.

[geeksville]

also - this feature will be built on top of #169 (mqtt gateway support)

[mc-hamster]

Closing as duplicate of #169