refactor: code cleanup

ajax/calcBruttoPrice.php

ajax/frontend/showB2BB2CWindow.php

ajax/money/formatPrice.php

ajax/output/getEntityData.php

ajax/output/sendMail.php

ajax/products/calc.php

ajax/products/getProductEdit.php

ajax/products/hasProductCustomFields.php

ajax/products/parseProductToArticle.php

ajax/products/summary.php

ajax/settings/numberRanges/list.php

ajax/settings/numberRanges/set.php

ajax/userData/getContactEmailAddress.php

ajax/userData/getUserEmailAddresses.php

src/QUI/ERP/Address.php

src/QUI/ERP/Comments.php

src/QUI/ERP/Debug.php

src/QUI/ERP/Defaults.php

src/QUI/ERP/EventHandler.php

src/QUI/ERP/Manufacturers.php