[w3c/manifest] Create test suite to check Web App Manifest feature support (#666)

The core issue is that most features come to play only after the “add to home screen” step, i.e., require manual interaction with a browser first, and then manual review with the operating system (e.g., verify which icon was used on the home screen) and other apps (e.g., verify if the scope is respected). A first stab at the most basic level (initially focused on iOS but useful on other platforms as well) is https://ios-a2hs-demo.glitch.me/, but many questions remain. 

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https://github.com/w3c/manifest/issues/666