Format for slot formatting in utterances

[sheosi]

Utterances as they stand now have no way of expressing which slots contain and where they are, some way of identifying this is needed.

Some possibilities:

• As special characters inside the utterance itself: "Hello and welcome to ${place}". This needs escaping if we want them to be shown.
• Having the utterance broke down into pieces: [ {text: "Hello and welcome to "}, {slot: "place"} ]. In this form we can add more data into
• Having the slots indicated as positions: { text: "Hello and welcome to my place", slots: [{name:"place", start:21, end: 29}]. This form might be faster when translating into some NLUs (as they need an example) but it is pretty cumbersome to implement.

[sheosi]

For now, I find the second way to be the best one.