Enable configuring of the name of the 'label' and 'group' properties

[davidtimovski]

This would really help when we're working with models coming from the server. I have to either add the label and group properties to my back-end model solely for the autocomplete (which the server shouldn't really know about) or I have to do the same on the front-end or extend the TS class with the AutocompleteClient - which forces me to use a different model than my usual.

I know in JavaScript you can use a object["propertyName"] syntax to get properties so enabling us to configure their name shouldn't be too difficult.

It would really help improve code maintainability.

[stale]

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