Change Details

Pull request description: >For at least QR-code based pairing of mobile wallets with nodes, it will be desirable to render QR codes even without wallet support. > >Therefore, this prepares by moving the QRImageWidget out of a wallet-specific file into its own qrencoder file-pair. This is part 1 of 2 of backport of Core [[https://github.com/bitcoin/bitcoin/pull/15928 | PR15928]]

Pull request description: >For at least QR-code based pairing of mobile wallets with nodes, it will be desirable to render QR codes even without wallet support. > >Therefore, this prepares by moving the QRImageWidget out of a wallet-specific file into its own qrencoder file-pair. This is part 1 of 2 of backport of Core [[https://github.com/bitcoin/bitcoin/pull/15928 | PR15928]] Commit [[https://github.com/bitcoin/bitcoin/pull/15928/commits/77851ab682bf94f78874a245919bcc4b79dc054e | 77851ab6]]

Pull request description: >For at least QR-code based pairing of mobile wallets with nodes, it will be desirable to render QR codes even without wallet support. > >Therefore, this prepares by moving the QRImageWidget out of a wallet-specific file into its own qrencoder file-pair. This is part 1 of 2 of backport of Core [[https://github.com/bitcoin/bitcoin/pull/15928 | PR15928]] Commit [[https://github.com/bitcoin/bitcoin/pull/15928/commits/77851ab682bf94f78874a245919bcc4b79dc054e | 77851ab6]]