fix(phpstan): allow null as parameter in various functions

See merge request !45

This commit changes the incorrect return type message found in the phpstan-baseline.neon file.
Return type of method ShippingTimePeriod::getFrontendView() has been correctly aligned to match
that of TimePeriod::getFrontendView(). This ensures clear and accurate type error messages that
adhere to the standard format.

Updated the error message in the phpstan-baseline to reflect the compatibility between the
getFrontendView methods in ShippingTimePeriod and TimePeriod classes.

This commit resolves multiple issues identified by the phpstan static analysis tool. The erroneous
types and classes in `AbstractShippingEntry.php`, `EventHandler.php`, `ShippingTimePeriod.php` have
been refractored to match the correct class and method signatures. The erroneous sections have been
updated with the appropriate classes and methods for QUI\\\\ERP\\\\Accounting\\\\Invoice,
QUI\\\\ERP\\\\Accounting\\\\Offers, and QUI\\\\ERP\\\\SalesOrders.

Related: #55

This commit refactors the getShippingPriceFactor method in the Shipping.php file, by adding a line
break for the method's parameter for better visibility and readability.

This commit enhances the type enforcement in the Shipping module by explicitly checking for method
existence before calls on variable types. In addition, it enforces argument type checks for several
function and method declarations to avoid type-related errors. Moreover, the error handling in
different functions has been improved by catching potential exceptions and logging them for debug
purposes. The commit also optimizes a PHP sorting function by leveraging the spaceship operator
instead of using conventional comparisons.

Related: #55

This commit includes several changes to improve type handling and the returns of various methods.
It includes changes in files related to Shipping rules and status, as well as tracking. Notable
changes include:

- Refactoring of method signatures and corresponding usages to use type hinting for better error
handling.
- Fixed return types in Factory.php to return more specific types (ShippingRule and ShippingEntry).
- Adjusted the createShippingStatus method to convert `id` to string before passing it to setValue
method in Config.
- Fixed active carrier filtering in Tracking for boolean conversion.
- Modified handling and events related to shipping in ShippingEntry.php and Factory.php.
- Other minor cleanups and refactorings.

Related: #55

Updated method argument typings from `Type $var = null` to `null | Type $var = null` across
multiple files to improve readability and understanding of the code. This change aligns with modern
coding standards and the principle of explicit over implicit.
Affected files:
- `AbstractShippingEntry.php`
- `AbstractShippingType.php`
- `ShippingInterface.php`
- `ShippingTypeInterface.php`
- `Factory.php`
- `ShippingRule.php`
- `Shipping.php`

PHP9 + PHP8.3 null deprecated

This commit does the following changes:

1. Updated the PHPStan version from 1.11.8 to 1.12.13 in phars.xml
2. In various classes, added the possibility to pass `null` as a parameter to a number of
functions. Affected classes include but are not limited to: `ShippingInterface`, `Handler`,
`Status`, `StatusUnknown`, and `ShippingEntry`.
3. Updated return types in the `ShippingEntry` class to include `null` option.
4. Simplified return types in various places from `datatype|datatype|null` to possibly nullable
`datatype`.

PHP9 + PHP8.4 null deprecated

fix: consider null at canUsedWithAddress (old code)

See merge request !44

Next 2.x

See merge request !42

Add QUIQQER Tooling

See merge request !32

fix: shipping debug triggers Fatel Error

See merge request !40

fix: shipping debug triggers Fatel Error

See merge request !39

related: #54

fix: shipping rule does not open

See merge request !38

related: #52

fix(ShippingRules): remove buttons attribute from options

See merge request !36

Related: #52

fix: if linked entities, then do not set standard shipping

See merge request !35

If a standard shipping is set, it is not automatically set to erp entities if these have linked erp entities.
In this case, these erp entities have been created from the others. the shipping has then been changed, deleted, etc.

fix: call to undefined method addStatusMail

See merge request !34

fix: sendStatusChangeNotification allowes every erp entity

See merge request !33

Next

See merge request !31

fix: quiqqer/quiqqer locale and paths adapted to quiqqer/core

See merge request !30