Issue #2918290 by chOP, somersoft, longwave, amateescu: Incorrect return type documented for \Drupal\field\Entity\FieldStorageConfig::loadByName

Issue #2696103 by Gabr1el, DerekCresswell, ashok.gharpankar, chOP, alexpott: \Drupal\Core\Config\FileStorageFactory::getSync() should throw a more specific exception

Issue #2349759 by davidhernandez, mortendk, rteijeiro, harish86, Sumit kumar, saki007ster, Mukeysh, brahmjeet789, nitishchopra, falkendk, Maninder, Vidushi Mehta, Ashish sandil, jitendra verma, crowdcg, sivaji@knackforge.com, dernetzjaeger: Copy system templates to Classy.

#184876 by dijnz, merlinofchaos and myself: non-phptemplate files were not discovered - implement proper extension chopping

Truncate UTF-8 patch. Introduced a new function truncate_utf8() for chopping off strings at unsure locations, without risking incomplete UTF-8 data.