Added support for virtual backoffice icons (#12833)
Added support for virtual backoffice icons (#12833)


abryukhov/Umbraco-CMS,umbraco/Umbraco-CMS,abjerner/Umbraco-CMS,umbraco/Umbraco-CMS,abjerner/Umbraco-CMS,abryukhov/Umbraco-CMS,umbraco/Umbraco-CMS,arknu/Umbraco-CMS,abjerner/Umbraco-CMS,abryukhov/Umbraco-CMS,arknu/Umbraco-CMS,abryukhov/Umbraco-CMS,arknu/Umbraco-CMS,umbraco/Umbraco-CMS,arknu/Umbraco-CMS,abjerner/Umbraco-CMS