[w3c/webcomponents] Change 'CSS Modules' name to avoid webdev confusion (#843)

@stubbornella first alerted us to web developers having confusion with CSS Modules and the popular [CSS Modules](https://github.com/css-modules/css-modules) project which helps handle CSS scoping. Since the name CSS Modules is never surfaced within the API and is only used in the specification I think it's safe to change how the specification references it to avoid web developer confusion (heck it will help in SEO too :) ).

Here are some of the options I've heard:

1. Style Modules
2. StyleSheet Modules

Any other suggestions are welcome.

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