GitLab

- Add new CefBrowserHost::SetAccessibilityState method for toggling
  accessibility state when readers are detected by the client.
- Add new CefAccessibilityHandler interface for the delivery of
  accessibility notifications to windowless (OSR) clients.
- Fix delivery of CefFocusHandler callbacks to windowless clients.
- cefclient: Add example windowless accessibility implementation on Windows and macOS.
- cefclient: Automatically detect screen readers on Windows and macOS.

- Windows: Fix excessive Ninja build warnings.
- Windows: Fix ATL detection for different VC toolchain paths.
- Windows: Fix Ninja Debug build when official build sandbox is enabled.
- Update build tool version recommendations.

The default hash implementation will now always be used.

- Remove CefWindowInfo.transparent_painting_enabled. Set
  CefBrowserSettings.background_color to an opaque or transparent
  value instead.