macOS: Allow windows to be created on any screen within the virtual desktop

Setting the geometry of a window to a position outside of the primary screen,
but within the virtual desktop, would not result in the window being created
on the secondary screen, as macOS does not seem to translate the global screen
position when creating new windows.

We work around this by translating the position ourselves, and using the
overload of [NSWindow initWithContentRect:] that takes the NSScreen to
create the window on.

Due to a bug in the macOS window manger, this fails for windows that are
created within a certain region of rotated screens. This is not an issue
for setting the geometry after creating a window, so we should investigate
making the window-creation code set its geometry via the same code path, after
creating the window (without having the window momentarily show up in the
wrong position).

Change-Id: Iba8eefe65e2c91667856299d90a8606e361ceacb
Reviewed-by: Erik Verbruggen <erik.verbruggen@qt.io>

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