Show private keys as QR codes

[justusranvier]

I have an Armory wallet that I use to generate keys for a mobile Mycelium wallet, since Mycelium doesn't have deterministic wallet support yet and because I want to use Armory's backup system for those keys.

Currently I can generate the keys in Armory and get the private Address Key Information screen, but in order to import those to Mycelium I have to use an external text-to-QR code application.

Displaying the BIP38 QR code on that screen would make this process easier less error-prone.