Add-ons [AL] Core Package 1.8.8

The update applies a definitive fix for the class extension hack, based on suggestions from @Xon.

The update is backward-compatible with our add-ons, so applying the update will keep the current hack active, however, once you have upgraded other our add-ons to the latest versions (new versions of all Filter add-ons will be released within 24 hours to support the new system), you can disable the hack by unchecking the option Legacy Class Extension Hack in add-on options page. Once unchecked, the legacy system will be deactivated, and any compatibility issues with third-party add-ons should be resolved.

• This version fixes a bug that could cause compatibility issues in class extensions with other add-ons.
• Please apply if you are using any older version of this package.
• Thanks to @Xon for highlighting the issue and the solution.

• Admin panel pages support for code editor fields. Please apply if any of your products require this version.