Deprecate implicitly nullable parameter types

[thekid]

See https://wiki.php.net/rfc/deprecate-implicitly-nullable-types

• Throwable.class.php - E_DEPRECATED: Implicitly marking parameter $cause as nullable is deprecated, the explicit nullable type must be used instead
• Environment.class.php - E_DEPRECATED: Implicitly marking parameter $platform as nullable is deprecated, the explicit nullable type must be used instead
• Runtime.class.php - E_DEPRECATED: Implicitly marking parameter $options as nullable is deprecated, the explicit nullable type must be used instead
• Date.class.php - E_DEPRECATED: Implicitly marking parameter $timezone as nullable is deprecated, the explicit nullable type must be used instead
• VirtualProperty.class.php - E_DEPRECATED: Implicitly marking parameter $name as nullable is deprecated, the explicit nullable type must be used instead
• Properties.class.php - E_DEPRECATED: Implicitly marking parameter $filename as nullable is deprecated, the explicit nullable type must be used instead

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⚠️ Note: These can not be fixed syntactically in a way that works with all PHP versions PHP 7.0 - 8.4, see xp-framework/rfc#343 (comment). We either need to drop support for at least PHP 7.0 or remove the type hint. Both create BC breaks.

👉 Workaround: For XP 11, we'll go with suppressing these errors via error handler.