Catalog alias mapping accepts catalog ID

In a multi-catalog scenario the catalogs to be displayed are configured in LiveContext settings. All references to catalog items (products, categories) are using an alias name of the catalog. The alias mapping to concrete catalog names are also configured via LiveContext settings. Alternatively to the catalog name also the external catalog id can be used. In some environments this is a better approach because the name is localized and can change more frequently.

(CMS-19058)