High contrast conditional classes

[chris-doucette-stack]

Summary

This PR adds the ability to apply conditional font color and background color classes to high contrast themes.

How to test

I added a section for it to our conditional classes docs, you can see it in action there by:

• running npm start
• navigating to the high conditional class section
• add theme-highcontrast to the documents body (you may want to edit the DOM and change the class from hc:fc-black-600 to something like hc:fc-red-600 it pops out more visually)

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Latest commit: 05dad8a

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