Add compatiblity to tab.hide API

[Croydon]

• Better interaction with tab groups add-ons #4 (comment) (75d2aa2)
  • which means respecting the tabs.tab.hidden attribute https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/tabs/Tab
• Make sure that reloadAllVisibleTabs and closeTabsRelativeTo respects hide (bf5499d)
• Make sure that bookmarkAllVisibleTabs respects hide (95fe4ac)
• Make sure that selectNextToActiveTab respects hide (6dc76cd)
  • Make sure that the experimental feature to change the active tab by mouse wheel scrolling respects tab hiding
• Evalute if it is useful to request the tab.hide permission for VTR
  • Does VTR want to provide options by itself to hide/show tabs? (likely not)
    • not for now at least