Add initial voice-capabilities binding support

Add support for subscribing to and using the guimetadata events from
the vshl-capabilities binding. A GuiMetadata class is used to wrap
things as it is likely that users of the other voice capabilities
would not overlap if e.g. navigation event support is later added.
At the moment, only the BodyTemplate1, BodyTemplate2, and
WeatherTemplate guimetadata types are handled, and there is room for
significant improvement in the Qt model exposed, which is somewhat
crude with respect to image URL handling. As well, the weather
template handling does not expose the full forecast, a full
implementation of that would require adding an actual model that
maps to a list view rather than a simple QObject.

Bug-AGL: SPEC-3110

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I33fc2440ebdc2a4a2de79ff0a49acbc422c47da2

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