[w3c/manifest] Required WebAppManifest Member clarification (#799)

I'm working on building a validator for this spec and have found the definition for "required" members very vague. [Mozilla](https://developer.mozilla.org/en-US/docs/Web/Manifest) marks several members as required but the `WebAppManifest` dictionary on the spec page indicates no required top level members (there are some in the `ImageResource ` dictionary and others). 

Is this correct that no member of the `WebAppManifest` dictionary is required? 

If this is the case maybe it's worth come kind of clarification statement somewhere in the spec.

Thanks!

## Related Issues:

#24 



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