Add logic to deal with interruptions at intermediate states during key generation and setup

[matthme]

This PR adds logic to deal with cases where the launcher setup fails or gets interrupted by the user at intermediate steps.

Specifically:

• If Launcher gets started up with lair keystore already initialized but no device seed imported yet, it will prompt for the password chosen in the (partial) setup process earlier and then check for the quickSetupChosen variable in local storage
  • If the variable is present in local storage, then the quick setup is completed automatically
  • If the variable is not present, the user is directed to a special page telling them that they need to complete their setup and can either click on "Finish Advanced Setup" or "Skip and Launch (Quick Setup)". If they choose to finish the advanced setup, they will be routed to step 3 of the advanced setup, without the option to go back to earlier steps of the advanced setup
• If key generation and/or import fails during the final step of Quick Setup, the user will be re-prompted for the password to be able to re-attempt.