Implement better autosave timing.

[louh]

Currently, it autosaves to localStorage after a user clicks 'next'.

This is not ideal because:

• It will save before loading the relevant data on the new section, and not save again until after the user navigates away.
• There's nothing that autosaves progress on particularly long sections, like the description text field.

An alternative would be to manually call the autosave function after certain actions, like after loading a parcel, or matching the user to a LV business category. Or set a timer on the application that saves the state of UserData every x seconds?

[louh]

I figured out how to save the application during window.onbeforeunload, which is pretty good, but it doesn't save user input because that input hasn't been captured yet.