Improvements to image gallery
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Allow to indicate the number of thumbnails per gallery; (actual only 12, suggest: input text support max value 50?);
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Allow to indicate the image(icon) that represents the gallery; (actual icon default the directory);
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Add the button to create a gallery inside another (it's already possible using control panel);
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Setup to display the gallery by: date or name (alphabetical order);
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Add support enable or no 'Download zip the gallery'