iOS: Properly support QInputMethod's visible and animating properties

We now emit and change the 'visible' and 'animating' properties of the
QInputMethod according to the documentation, which means the 'visible'
property will change immediately when the keyboard is about to become
visible, or about to hide, and the 'animating' property will determine
if the visibility-change is just starting out, or has ended.

The keyboard rect will at all times reflect the currently visible area
of the virtual keyboard on screen (in focus-window-coordinates), not
future state after the animating completes. Getting the future state
is a missing piece of the QInputMethod API, and could be solved in
the future by adding arguments to the animatingChanged signal that
allow platform plugins to pass on the before- and after states.

The logic for determining the keyboard state has been moved into
a central function, updateKeyboardState(), which allows us to change
and emit property changes atomically. There is still some parts left
of the old approach, but these are left in to make further changes
to the code easier to diff and understand in isolation.

Change-Id: Ica52718eba503165ba101f1f82c4a425e3621002
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@theqtcompany.com>

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