Make focusable UI elements on Android TV

[artemiv4nov]

All elements should be focusable on device.

Need to fix focusable state for following elements:

• Quick settings activity
  • Buttons
  • Privacy level dialog
  • "Not now" buttons
• Main activity
  • "Since" statistics view
  • Protection level view
• Side bar
  • "Get premium" button
• Apps management
  • Context menu in toolbar
  • Sort order dialog elements
  • Bulk change dialog elements
  • Activity elements
  • App details activity
    • Context menu
    • Activity elements
• Filtering log
  • Context menu
• Settings
  • Context menu
  • Export settings dialog
  • Import activity elements
• General settings
  • Auto-update filters dialog
  • Update channel dialog
  • App languages dialog
  • Notification settings element
  • Theme switch (focus should not be reset after theme changing)
• Content blocking settings
  • Filters activity all included elements
  • Whitelist context menu
  • Whiltelist list elements
  • User filter context menu
  • User filter import dialog
• DNS filtering settings
  • Context menu
  • All list elements
• Extensions settings
  • New extension dialog
  • Extensions list elements
• Network settings
  • Add proxy server dialog
• Advanced settings
  • list elements
  • Logging level dialog
  • Export logs and system info activity
  • Low-level activity all elements
• Support activity
  • Send feedback dialog
  • Feedback checkbox
• License status activity
  • Context menu (both)
  • Enter email address dialog (checkbox)
• Battery usage activity
  • List elements (should be completely focusable)
• Exit dialog

[admitrevskiy]

Done partly. We should fix the following:

• Onboarding dialogs
• LowLevel Settings screen
• Replace ListViews with out custom views inside with RecyclerViews