WooCommerce Measurement Price Calculator 3.23.6

* Fix - Avoid "division by zero" fatal errors when adding some items to cart
* Tweak - The number of decimals used when rounding can now be adjusted using the "wc_measurement_price_calculator_measurement_precision" filter (recommended when dealing with very small values)
* Tweak - Update product data lookup table with correct minimum and maximum prices, this ensures MPC products can be accurately sorted by price
* Fix - Ensure prices are displayed correctly when using these settings: prices entered exclusive of tax, prices displayed including tax

* Fix - Some area/volume values were appearing as `0.00` incorrectly when the value contained decimals.
* Fix - Correctly restore full measurement quantity upon issuing a refund.

* Fix - Resolve a Pricing Table issue where certain measurement values were unable to be added to the cart
* Fix - Improve handling of non-US currency prices, particularly price per unit calculations for variable products
* Fix - Resolve an issue where customers are unable to manually enter a decimal length when an increment is specified
* Tweak - Ensure measurement values are saved in the database in the same format for both simple and variable products