feat: Positionen mit Zusammenfassungen, Listenberechnung umgesetzt

ajax/invoices/temporary/calc.php

ajax/invoices/temporary/product/hasProductCustomFields.php

bin/backend/controls/InvoiceArticleList.js

bin/backend/controls/articles/Article.css

bin/backend/controls/articles/Article.js

bin/backend/controls/panels/TemporaryInvoice.Summary.css

bin/backend/controls/panels/TemporaryInvoice.Summary.html

bin/backend/controls/panels/TemporaryInvoice.Summary.js

bin/backend/controls/panels/TemporaryInvoice.js

bin/backend/controls/panels/product/AddProductWindow.js

locale.xml

user.xml