Improve typedefs for icon names

[joshualamusga1]

Describe the feature that you would like added

It would be nice to have strongly-typed icon names. It's added type-safety and helps us find icons. There are no downsides beyond whatever maintenance is required.

What component or utility would this be added to

A new type definition should be added. It should look something like this:

export type FontIcon = "12PointStar" | "6PointStar" | "AADLogo" // ...and so on

The type definitions where an icon name would be supplied should be updated. Instead of taking string | undefined, take FontIcon | undefined. Anything else that logically expects an icon name should be similarly updated.

Have you discussed this feature with our team, and if so, who

Nope, no discussion so far.

[jdhuntington]

@joshualamusga1 This is a good idea; thank you! I will figure out where this can go on our roadmap.

[jdhuntington]

The one wrinkle I'm not immediately sure how to solve is the presence of custom icons ( https://github.com/OfficeDev/office-ui-fabric-react/wiki/Using-icons#registering-custom-icons ). I'm sure there's a good solution though.

[msft-fluent-ui-bot]

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