Privacy Panel new pull request

This is a new pull request. We had to remove the old one due to big problems with git and some Schroedinger patches....
Please follow https://github.com/mozilla-b2g/gaia/pull/25688/files#diff-e184b32949de6d6da4dd515fcc11be11L45 to pass all needed elements inside `PrivacyPanelItem({})` instead of querying it inside because we want to decouple UI & Model codes.