Implement "presentation" feature for window.open()

Implement "presentation" feature for window.open()

Add "presentation" feature for the window.open() call, which opens a new fullscreen browser
window on the first found secondary display by adding a new window disposition and a new
fullscreen mode for the Browser object.
A new notification bubble text is added and shown in this case. The secondary browser window
can be closed by pressing escape while focused, or by programmatically closing it from the
opener page.

(Not meant for review.)

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