[w3c/manifest] Add Manifest property to hint whether the navigation UI should be visible (#765)

In the same spirit of: https://fullscreen.spec.whatwg.org/#enumdef-fullscreennavigationui

This will allow websites that are in fullscreen, standalone or other compatible modes to hint the UA as to whether they would like the navigation UI to show up. We could re-use the same values as the fullscreen spec ("auto"/"show"/"hide").

An obvious benefit would be for websites that use the fullscreen display mode to be able to benefit from this feature from the fullscreen API but we could also have UA allowing this setting for standalone applications.

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