PHP 8.2 Deprecated function: Creation of dynamic property OmegaThemeRegistryHandler::$trail is deprecated [#3432924]

Problem/Motivation

On PHP8.2 I caught an error message

Deprecated function: Creation of dynamic property OmegaThemeRegistryHandler::$trail is deprecated in OmegaThemeRegistryHandler->__construct() (line 37 of .../omega/omega/includes/registry.inc).

Steps to reproduce

Switch to PHP8.2 and check dblog

Proposed resolution

I would suggest adding #[\AllowDynamicProperties]. Also, we can add array property, however, I think there may be some issues with some legacy code and theme inheritance if they return NULL.

Issue fork omega-3432924

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3432924-php-8.2-deprecated changes, plain diff MR !4
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