Merge pull request #12 from quamotion/fixes/optional-arguments

...DevTools/Protocol/iOS/Page/JavascriptDialogClosedEvent.cs

...evTools/Protocol/iOS/Page/JavascriptDialogOpeningEvent.cs

...e/ChromeDevTools/Protocol/iOS/Page/LoadEventFiredEvent.cs

source/ChromeDevTools/Protocol/iOS/Page/ReloadCommand.cs

...e/ChromeDevTools/Protocol/iOS/Page/ScriptsEnabledEvent.cs

...romeDevTools/Protocol/iOS/Page/SearchInResourceCommand.cs

...omeDevTools/Protocol/iOS/Page/SearchInResourcesCommand.cs

source/ChromeDevTools/Protocol/iOS/Runtime/CallArgument.cs

...omeDevTools/Protocol/iOS/Runtime/CallFunctionOnCommand.cs

...ols/Protocol/iOS/Runtime/CallFunctionOnCommandResponse.cs

...ce/ChromeDevTools/Protocol/iOS/Runtime/CollectionEntry.cs

source/ChromeDevTools/Protocol/iOS/Runtime/EntryPreview.cs

...ce/ChromeDevTools/Protocol/iOS/Runtime/EvaluateCommand.cs

...eDevTools/Protocol/iOS/Runtime/EvaluateCommandResponse.cs

...ools/Protocol/iOS/Runtime/ExecutionContextCreatedEvent.cs

...Tools/Protocol/iOS/Runtime/GetCollectionEntriesCommand.cs

...s/Protocol/iOS/Runtime/GetDisplayablePropertiesCommand.cs

...ol/iOS/Runtime/GetDisplayablePropertiesCommandResponse.cs

...romeDevTools/Protocol/iOS/Runtime/GetPropertiesCommand.cs

...ools/Protocol/iOS/Runtime/GetPropertiesCommandResponse.cs