Fixed dynamic include errors caused by unlicensed elastic social

Added template fallback to avoid dynamic include errors if the "Elastic Social" extension is used, but Elastic Social is not licensed.

(CMS-22913)

Fixed a bug where the timezone was always GMT

Fixed a bug in the com.coremedia.livecontext.handler.FragmentCommerceContextInterceptor where the timezone would always be translated to GMT no matter what value it had.

(CMS-22675)

RSS Feed Source for CMChannel Fixed

Method CMChannelImpl#getFeedItems() would return the linked items of page placement main in the wrong type, leaving an RSS feed for a page empty. This is fixed and RSS feeds for a page can now be delivered.

(CMS-17459)