iOS: Calculate screen (available) geometry using [UIView convertRect]

Instead of custom logic to detect portrait/landscape and the height of
the status bar. The latter would fail when the statusbar/orientation was
set explicitly through [UIApplication setStatusBarOrientation], as the
statusbar would not follow the normal behavior of covering the top part
of the screen. The new code also handles upside-down portrait mode, as
well as iOS8's behavior of reporting screen bounds and application
frame in interface orientation instead of device orientation.

Change-Id: I54e3b99246a32e17aaba13960f456fa823768fd8
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

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