PIN-protection for private key (WIF)

[chill117]

Add optional PIN-protection to the app. When a PIN is set, any action that requires the private key (WIF) should ask for the PIN before the action can be performed. Examples:

• When sending a payment (+ double-spend)
• When exporting the private key to clipboard or displaying as QR code

When the PIN is set, the private key should be encrypted with AES where the PIN is the secret key.