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Beta Release 0.8

MainDialog updates

Steps for updating to Waterfall MainDialog implementation

Steps

Move introduction logic to DefaultActivityHandler OnMembersAddedAsync method.
Copy routing logic from OnMessageActivityAsync method into RouteStepAsync method.
- Change any switch statement cases that start new dialogs to return the result of BeginDialogAsync like below for proper dialog flow management:
  
  Previous implementation
```
  await dc.BeginDialogAsync("Faq");
```
  New Implementation
```
  return await stepContext.BeginDialogAsync("Faq");
```

Copy interruption logic from OnInterruptDialogAsync into InterruptDialogAsync

InterruptionActions have been deprecated, so each interruption should now manage the dialog continuation/cancellation on its own.

Previous implementation

  case GeneralLuis.Intent.Cancel:
      {
          await dc.Context.SendActivityAsync(_templateEngine.GenerateActivityForLocale("CancelledMessage"));
          await dc.CancelAllDialogsAsync();
          return InterruptionAction.End;
      }

New Implementation

  case GeneralLuis.Intent.Cancel:
  {
      await innerDc.Context.SendActivityAsync(_templateEngine.GenerateActivityForLocale("CancelledMessage", userProfile));
      await innerDc.CancelAllDialogsAsync();
      await innerDc.BeginDialogAsync(InitialDialogId);
      interrupted = true;
      break;
  }