Upgrade/v2 voice support and fixes

[nirvanatikku]

This PR consists of enabling DLGaaS with orchestrated Voice (ASR) support, using gRPC-Web, theme/branding support for the chat skin, and a myriad of fixes and improvements. This is a 2.0 release.

• Resolves DLGaaS with Voice Input (ASRaaS) #92
• Resolves Orchestrated TTS should use ttsParameters #93
• Resolves Offer branding / skinning of ChatPanel #99
• Resolves Differentiate visual messages and nlg message in chat panel #95
• Resolves Update title: include more insight #97
• Fixes IVR Sim: RecognitionSettings causing browser to hang #94
• Fixes Log events filtering and sorting unstable #96
• Fixes Chat Panel should not AutoScroll when in focus #98
• Fixes IVR Voice Input with TTS - strange interrupt / timeout behaviour #101
• Fixes Log events not appearing #89
• Fixes ASRaaS - cannot change language #106

Note: DLGaaS proxy functions are no longer in play; but remain. Response objects can be made backwards compatible by replacing (removing) names of variables of array type, ending with 'List'.

[nirvanatikku]

https://github.com/nuance-communications/mix-demo-client-azstaticwebapps/wiki/Development%C2%A0Guide-for-DLGaaS-(web-gRPC-WebSocket-support)