Add ability to use local options

[krzyzak]

Hey!

First of all, thank you for this component, it's very useful in my project! As a follow-up to #116, I added possibility to pass options Array, which then can be used in the component.

It also exposes 2 methods:

• optionMatches - by default, it does case-insensitive matching, but it can be customised.
• decorateResult - which can decorate options with whatever markup is needed in your app.

It allows you to pass not only a plain array, but also an array of objects, with different name and values.

I didn't update the docs, nor did I provide any examples, because first I wanted to get your initial feedback on that.

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[ajhepple]

This is just the feature I wanted, thanks, but the proposed changes broke my remotely fetched options. Thankfully it was a simple fix, to add parentheses around the use of the ternary operator;

const html = await (this.hasOptionsValue ? this.fetchLocalOptions(query) : ...

Otherwise the wait doesn't apply to the remote fetch!