[w3c/manifest] Forbid browser to take screenshots (#661)

Hi,

on Android at least, there is a [flag](https://developer.android.com/reference/android/view/WindowManager.LayoutParams.html#FLAG_SECURE), used by banking apps for example, that forbid screenshots to be taken, for security reasons (mainly because another app should not be able to capture a screen with such sensitive data).

I'd expect webapps with similar sensitive data to be able to tell the browser that screen capture should not be allowed when the webapp is used. The webmanifest seems to me like the best approach for that.

Example: I build my own banking webapp, and I don't want other apps on my phone to be able to take a screenshot while I use my webapp.

Thanks for reading.

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