[Scopes] Make it possible to make preview images not interactive

[Albert Astals Cid]

One scope developer suggested to make it possible for preview images to be non interactive.

His rationale

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Personally, I think it doesn't make scene in most cases.

To take a trivial instance, weather scope. When user enter preview page, clicking a thumbnail looks weird since there is no more detailed info user can get when overlay layer popups.

In some practical cases, server only give us a low resolution image, so clicking it to popup overlay layer looks terrible(image scaling) in that case.

I think there's two cases for overlay display.
1.If image itself is big image(high-resolution), e.g photo scope. That makes scene since user can check more details in overlay layer by pinch/zoom-in/zoom-out.

2.showing low-resolution image in preview page and loading high-resolution image when overlay layer popup looks more reasonable, however we can't make sure there is always a high-resolution image url returned from server API.

It depends.

Basically I think there's no harm to add a property for this since we didn't disable it to make it bigger to display.Developer can adjust bigger image display in different scenario.
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