* ADD: Management of extrafields on customer prices, level prices and default prices
* ADD: sql table for managing extrafields on customer prices, level prices and default prices
* FIX: Add actions to update, add, delete extrafields and display extrafield
* FIX: colspan for customer price table
* ADD: Management of extrafields on customer prices
* FIX: Value and search for price label
* ADD: name in the files
* FIX: *
* FIX: PHP-cs fail
* FIX: comment in english, please
* FIX: variable naming and testing
* FIX: GETPOST array
* FIX: return is an array of strings, object array will be modified as well
* FIX: return array keys for Extrafields::fetch_name_optionals_label are string too
* FIX: do not mess with extrafields code and value
* Update llx_product_customer_price_extrafields.sql
* Update llx_product_price_extrafields.sql
* FIX: whooopsie
* FIX: PHP warnings
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Co-authored-by: Mélina JOUM <melina.joum@altairis.fr>
Co-authored-by: Laurent Destailleur <eldy@destailleur.fr>
