iOS: Flesh out initial QPlatformScreen implementation

We check the device's model identifier to tweak the screen values based
on the precense of older iPhone/iPod touch models, or the iPad Mini.
This does not work when running under the simulator, which reports its
model identifier as the architecture of the host platform. There doesn't
appear to be any APIs to get the simulated device of the simulator, but
if this becomes an issue we can always look at the UIDevice model and
screen resolution and apply a few heuristics.

We do not update the screen geometry on orientation-changes. This matches
what UIScreen reports for bounds, but may not be the most intuitive solution
from a Qt perspective compared to the way other platform-plugins work.

Change-Id: I74783e053601de9ce805f8b52b944c116f9a1e3e
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>

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