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Add ability to add custom send button component

1

## Feature Request Need ability to add a custom send button to replace the existing SVG being used. In fact adding custom components, not just for this send button, to...

## Describe the bug When using the `Bot.Builder.Community.Components.Middleware.SentimentAnalysis` package in Composer, [docs](https://github.com/BotBuilderCommunity/botbuilder-community-dotnet/tree/master/libraries/Bot.Builder.Community.Components.Middleware.SentimentAnalysis) says to use `${turn.Sentiment}`, although `${turn.Activity.Conversation.Sentiment}` is shown as the memory member used in the sample screenshots, to...