WebChat supporting DirectLine Speech requires an update to the way we configure the control in the Emulator. When the user connects to a bot we need to add a field to denote if it is a DL-Speech bot and if so, the WebChat needs to be instantiated with some additional user-driven parameters. See https://github.com/microsoft/BotFramework-WebChat/blob/master/DIRECT_LINE_SPEECH.md for more detail, and reach out to @compulim with questions.

[enhancement]