Display all pictures on catalog pages (configurable)

[AndreiMaz]

Currently, we display only one picture (the first one) on catalog pages such as categories, manufacturers, and other product boxes (e.g. related products).

Let's add a new catalog setting indicating whether we should display all available pictures. This setting will be disabled by default.

When enabled, customers will see a slider at the bottom of each picture block. It'll be visible only when a product has more than one picture. Similar to the attached screenshot:
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