* Merge DefaultRecord, FincMissing and SolrAI result list templates into one.
** Add metadata fields from SolrAI.
** Append subtitle to title.
** Since result_place und result_source are often identical, result_source is only display if it differs from result_place.
** Add snippets with highlighting.
** Indent metadata fields with multiple lines.
** Set "unknown" icon for all unknown types.
* change metadata order in results list
* update media icon mappings

* externalize icon mapping
** introduce ViewHelper function for icon mapping
** avoids multiple json parsing
** adds mapping for ElectronicArticle
* streamline naming

co-authored by: Dorian Merz <merz@ub.uni-leipzig.de>