Label blocks found by FutureBit devices

[hunicus]

Got a request from jstefanop of FutureBit to label blocks found by FutureBit's Apollo devices.

The devices mine solo. They put out between 2 and 9 TH/s depending on the device and settings but supposedly there are >100,000 of these things out there.

See example of coinbase tag here.

[jstefanop]

thanks you can close this, opened PR below

#51