Passphrase not supported for signing transactions

[isaacvr]

Feature description

Support passphrase for signin transactions

Is your feature request related to a problem? Please describe.
If passphrase is configured on device then Skywallet manages an address sequence different from using no passphrase at all . Transaction signing handler does neither seems to be aware of this nor even offers .

Describe the solution you'd like
Implement usePassphrase in msgTransactionSignImpl and fsm_msgTransactionSign

Describe alternatives you've considered
This has to be implemented for consistency with other functions.

Additional context
Needs similar issues in client libraries.

Possible implementation

• Read device settings and use passphrase if option set
• Add optional usePassphrase in message to force using (ignoring) passphrase if value set
• If passphrase set derive master node from master seed prior to signing Skycoin transaction.