Add reading QRcode to facilitate the transaction
Created by: Tortue95
-Add QRcode Reader with WebRTC to import the public key easily
And in second time (the protocol need probably updated): -able to generate and read QRcode with public key and amount/label/message and the possibility to share it ex with BTC: https://github.com/bitcoin/bips/blob/master/bip-0021.mediawiki#appendix