Testing if Search API Solr did not break more stuff (it might)
Move the hooks to event subscribers.
Change dependencies to 4.3 or higher (older won't work bc the classes needed for the event are not present)
All our Solarium/query alters are in the main module file
See https://github.com/esmero/format_strawberryfield/issues/293
See https://www.drupal.org/docs/8/modules/search-api-solr/search-api-solr-howtos/how-to-replace-the-deprecated-hook-hook_search_api_solr_query_alter-with-prequeryevent
This implies: