Add BIP38

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By adding BIP38 it will be possible to make password protected nfc wallet tags

This is the library to integrate:
https://github.com/cryptocoinjs/bip38#versions

Enable BIP38 in the settings (ON/OFF)

than

After the Create NFC wallet button is pressed, pop-up an alert that says:

Creating an NFC tag 
with password:
[password field]

Enter the password and swipe the tag under the phone

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