macOS: Improve screen positioning during window creation

Allow AppKit to resolve screen for NSWindow lazily in the case where the
position is outside any known screen. And explicitly set the style mask
if detecting the corner case of positioning a window in the unavailable
space on a rotated screen.

In testing the effect of creating the window with a borderless style mask
and then updating the mask did not seem to have any visual consequences,
but we try to limit this mode just in case by only enabling it in the
corner cases we detect.

Change-Id: I4b7fcc6755a1ad5ff2683bec79d80a78226edae0
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

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