Issue 5661: filter params
#2906 - Set reviews count in tab to only count actual reviews

Nested comments shouldn’t be treated as reviews. This addresses that by
using `$product->get_rating_count()` to determine the correct number of
reviews, instead of get_comments_number.

It can be filtered using the new `woocommerce_product_reviews_count`
filter.
Remove previously added filter, not necessary
Split up save_tax_rates() method
Merge pull request #6798 from bryceadams/patch-2906

#2906 - Set reviews count in tab to only count actual reviews
Redo construct and move settings/html to separate files
Fix refund class
Corrected format_ methods
Moved delete tax rate rule
Added method for expanding postcode ranges
Tax rate importer parse error
Optimise tax rate importer and use same code as tax settings class
Move widget registration to own function/file - avoid register_widget in class files
combine city and postcode save logic
#5537 - Fix bulk edit overlap, bulkedit improvements
Change remove_order_items subqueries to inner joins.
Closes #6804
Hat tip Jason @ WPEngine
twentyfifteen wrappers. #6797
twentyfifteen styles. #6797
twenty fifteen styles. closes #6797
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