[AndyB] Featured images 2.8

Description:

Displays a block containing featured images.
Featured images will display three small images in your forum list. The images are attachments that your members have posted. Images are updated every 5 minutes. Images when clicked will display the message the attachment was posted in.

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Featured images v2.1 changes:

Updated andy_featured_images.less template.

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Updated abstracted file system code.

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Fixed issue with image selection condition.

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Improved error handling code.

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Featured images v2.5 changes. Now compatible with XenForo Cloud. If upgrading from previous version, please create a new directory /data/files/featured_images using File manager, also the Options page Image URL field needs to be updated.

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Added Log errors to options page.

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Featured images are now square.

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Now supports WebP attachments.

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