Implement Security (password) management flow

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1. When a user selects Security from the Accounts sub-menu, they should see a screen prompting them update their password.
   
2. When the user supplies a minimally viable password and they have successfully repeated their password, and they have provided an old password, enable the Save button.
   
3. When the user clicks Save, user their old password to validate and update their new password.

Note:

• Determine minimum password requirements
• Does updating a password have implications on information stored? Will we need to update or re-encrypt after a password change?
• Is there a particular type of encryption we should use? We are using secure storage which will prompt for the password.... it will likely as the user to unlock their keyring.