2.2.0

Added

• Add NetVips.BlockUntrusted and Operation.Block for blocking operations at runtime.
• Add image.SignalHandlersDisconnectByFunc and image.SignalHandlersDisconnectByData for disconnecting signal handlers that match.
• Implement image.OnPostClose remove event accessor.

Changed

• Update methods/enums for libvips 8.13.
• Remove internal VipsSaveable enum.
• Avoid throwing general exceptions.
• Ensure debug and unit tests functions are internal.

Fixed

• Use the correct type for signal handler IDs.