App changes and additions

Added the option to display a list of certificates imported after the user logs in.

Improved the proces of logging in and verifying the account.

Other minor improvements.

Separation of eToken (Key602) from Signer.

Updated icons and app environment.

Expanded login options to Sofa/602ID accounts.

Expanded options for login management in Settings.

Added proxy setting options.

Fixed logging out automatically when set to "On exiting Signer".

Fixed other reported errors and more minor improvements.