This commit includes changes made to both the Article.php and ArticleList.php classes in the
QUI\ERP\Accounting directory. The setUser methods now accept a null type for the 'User' parameter,
giving more flexibility when calculating user details.

Type hinting was also improved in the ArticleList class. The variable type indicators were changed
from 'int|float' to 'int | float', and from 'Factor|QUI\\ERP\\Products\\Utils\\PriceFactor' to
'Factor | QUI\\ERP\\Products\\Utils\\PriceFactor', improving readability and clarity of code.

Lastly, the 'template' and 'articleTemplate' parameters in the 'toHTMLWithCSS' method now support
both 'bool' and 'string' types, adding flexibility to template usage.

Updated calcArticleList method in Calc.php to ignore PHPStan warnings using the
`@phpstan-ignore-line` and `@phpstan-ignore-next-line` directives. Also, added a TODO comment
regarding net calculations.

Related: #103

Changed the constants 'TYPE_INVOICE_REVERSAL' and 'TYPE_INVOICE_CANCEL' to 'PAYMENT_STATUS_ERROR'
and 'PAYMENT_STATUS_CANCELED' respectively. This will ensure that the payment status are correctly
identified and processed.

fix: declaration of ArticleList::toHTMLWithCSS must be compatible with ArticleListUnique::toHTMLWithCSS

feat(ArticleListUnique): toHTML() can be passed to template engine and thus settings / variables can be passed on

Related: order-simple-checkout#12

(cherry picked from commit 21a31f8f)

Co-authored-by: Patrick Müller <p.mueller@pcsg.de>

Related: pcsg/buero#425

Related: pcsg/buero#344
Related: pcsg/buero#436

Related: pcsg/buero#344
Related: pcsg/buero#436

(cherry picked from commit 275e8d6c)

Co-authored-by: Michael Danielczok <michael@pcsg.de>

Code stability -> missing return types, qualifier imports, code cleanup, function converts to php8.1

related: #102

The ErpEntityInterface interface was changed in a previous commit.
We decided to declare this as a breaking change to create a version 3. with this commit pgpstan level 0 and 1 are also done.

BREAKING CHANGE: ErpEntityInterface extended