* Create background in popup if private mode, remove gates
* Add messaging support to runtime in private mode
* Fix messaging services and general bootstrap logic
* Add private mode warning, remove old component
* Deprecate launchGuardService
* Require in memory account for user to be considered authenticated
* Don't change icon for private mode windows
* Set all icons from background page
- more semantically accurate, will expose these as buttons to assistive technologies
- note: while having block-level elements like `<div>` inside a `<button>` is an html validation error, it does not affect functionality as long as there's no more structure inside it