+ deprecated json field support (-> obsolete)
+ event with dictionary support
+ updated sample not to use deprecated command (SetVisibleSizeCommand ->
SetDeviceMetricsOverrideCommand)

- Set NullValueHandling to NullValueHandling.Ignore, so that null values are not serialized
- If .NET primitive types (like bool or long) are optional, use nulltable types, so that they can be ignored when serializing

Add support for iOS devices. Create separate namespaces for the Chrome and iOS versions of the WebKit debugger protocol.