Dominik Schilling 944fba8e2f Widget Customizer: Improve support for dynamically-created inputs.
* Re-work how and when widget forms get updated.
* Replace ad hoc hooks system with jQuery events,
* Add `widget-updated`/`widget-synced` events for widget soft/hard updates.
* Enter into a non-live form update mode, where the Apply button is restored when a sanitized form does not have the same fields as currently in the form, and so the fields cannot be easily updated to their sanitized values without doing a complete form replacement. Also restores live update mode if sanitized fields are aligned with the existing fields again.

Note: jQuery events are *not* final yet, see #19675.

props westonruter.
see #27491.
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