Extend coding standard with new rules

[come-nc]

Proposition to add these rules to our standard:

• array_syntax: Force short syntax for array
• list_syntax: Same for list
• fully_qualified_strict_types: Remove namespace from classname when there is a use statement, and add missing backslash for global namespace
• no_leading_import_slash: Remove leading slash from use statement
• nullable_type_declaration_for_default_null_value: Add missing ? on type declaration for parameters defaulting to null. This will most likely be needed to avoid warnings in PHP 8.4.
• yoda_style: forbid yoda style comparision. This replaces null === $a by $a === null.

I undertand that adding rules will mean a huge changelog at some point, and confuse a bit git blame and backports, but I still think it is worth it.
It avoids doing such changes by hand when cleaning up old code, it avoids arguing about these things in PR review. It improves consistency across the codebase and makes it easier to read.
And for nullable_type_declaration_for_default_null_value it avoids future deprecation warnings (https://wiki.php.net/rfc/deprecate-implicitly-nullable-types - Not voted yet)

[provokateurin]

The added rules look reasonable

[nickvergessen]

I agree 👍

[nickvergessen]

So that will be 1.2.0 right?

[come-nc]

So that will be 1.2.0 right?

Yeah could be, is there a version number to bump somewhere?
Only CHANGELOG.md seems to have version numbers (and it’s outdated 😕 )

[nickvergessen]

I would have expected composer.json but seems it's only the tag

[come-nc]

Added missing entries to the changelog file, good to merge.
(It seems this repos dismisses reviews on push, so you’ll need to approve again)