Allow asset layer display to be body dependent.

Return a list of associated bodies on around/new pages and in category ajax
calls, and use that when deciding whether to show/hide layers. If the layer
has no body information, then we show it as before, maybe based on category
selected; if it does, it is only shown if the layer body matches the bodies
for the point.

As part of this create a new VectorAsset class to handle all the visibility
changes for asset layers as it makes it a bit tidier.

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