Add LockTime visibility for transactions

For transactions without default locktime, show the locktime value.
Merge pull request #423 from wozz/patch-1

Add LockTime visibility for transactions
added a new way to scan qr codes from mobile browsers
added a new library for fir canvas on ios/safari
merge
Merge pull request #424 from colkito/feature/mobile-qrcode-scanner

Feature/mobile qrcode scanner
fix of CSS for QR code scanner button
Merge pull request #427 from colkito/bug/qrcode-scanner-css-fix

fix of CSS for QR code scanner button
update versions
fix package json
Merge pull request #428 from matiu/feature/new-bitcore

Feature/new bitcore