Trezor Wallet Hardware Detection

[rdig]

While this is just a nice to have feature, I think there is a way to detect if the Trezor Hardware wallet is connected to the local bridge and, based on that, provide a status back to the user.

A rough idea on how to implement this, is to POST a message directly to the trezor service (directly POST not through the window's Object instance post() method) and listening for a response.