Added the ability to set the label and value key names

You can now set the names of the `label` and `value` keys in the options. They default to `label` and `value` to not break the current behavior, but you can also set them to `null`, so that you can use a simple object instead of an array of objects, just like in bootstrap-4-autocomplete.

Examples:
```
const ac = new Autocomplete(field, {
    data: [{name: "entry1", text: "The first entry"}, {name: "entry2", text: "The second entry"}],
    label: "name",
    value: "text",
    onSelectItem: ({label, value}) => {
        console.log("user selected:", label, value);
    }
});



const ac = new Autocomplete(field, {
    data: {entry1: "The first entry", entry2: "The second entry"},
    label: null,
    value: null,
    onSelectItem: ({label, value}) => {
        console.log("user selected:", label, value);
    }
});
```

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