Regions v5.2

Remove the option to select the categories shown in the list and ‘hide empty regions'. If they have listings they'll show. This greatly improves performance.
Include the sidelist on region page
Replace caret images with css
Add link label on expand box for accessibility
Remove font awesome for better performance.
Security: Added sanitizing and nonce checks.
New hook: wpbdp_region_find_args to adjust which regions will be included in the list
Fix: On the regions page in the back-end, correctly select the parent region when the “add child” link is clicked.
Fix: Always return to the top level to show all regions on the “manage regions” page, rather than saving the last region viewed
Fix: Fix a few areas with invalid HTML.
Fix: Update a bit of deprecated code.
Fix: Remove a rewrite rule that causes issues. Sometimes the rewrite was preventing regions from filtering
Fix: Make the single region category page look more like the listings category

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