Implement automatic resolving of references in referenced files

[cebe]

Currently references in referenced files are only resolved if the base type is known.

[cebe]

php-openapi/src/spec/Reference.php

Lines 113 to 118 in 4a4892d

	if ($jsonPointer === '') {
	$referencedObject->resolveReferences(new ReferenceContext($referencedObject, $file));
	} else {
	// TODO resolving references recursively does not work as we do not know the base type of the file at this point
	// $referencedObject->resolveReferences(new ReferenceContext($referencedObject, $file));
	}

[cebe]

fixed by 6288f41