Improve speech output

[TomSeldon]

Use speech synthesis markup (https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/speech-synthesis-markup-language-ssml-reference) to improve the realism of the speech output.

e.g.

• Emphasis on possible bar names when prompting for missing bar location
• Emphasis on beer name
• Try out marking up units (e.g. %ABV, quantity)

Need to try this against actual voice output instead of just testing the text response.

[YuCaIb]

I have been bumbed that issue for bunch of times and I wanted to leave this comment.
I don't know inside of this projecet but I've been searching this improving speech output via some emphasis work, for 6 weeks. I think it does not make sense to using ssml tags to make it better. For me, it was very hard to handling mapping the words and doing it in a programatic way. So I let it go, instead I looked for pitch corrrection, maybe applying auto tune would be better I tought but it seems it was not the case. Lately I'm looking in voiecelab and emphasis and emphassess to find a way apply something to tts output and make sound better.