Issue #2226437 followup by tstoeckler: [wrong patch committed] Create ContentEntityTypeInterface.
Issue #2218655 by sun, effulgentsia, jessebeach: Core expects $theme.settings default config file to exist.
Issue #2226241 by voidberg, claudiu.cristea: Saving image field or instance with an inexistent default_image crashes.
Issue #2233929 by alexpott, Berdir: drupal_set_time_limit() should only be able to increase the time limit.
Issue #2235347 by tim.plunkett: Field instance operations are out of order.
Issue #2178643 by ianthomas_uk, jhodgdon, jayeshanandani: Indexing status can show a negative percentage of content as having been indexed.
remove unused use statement
some consistency on compiler passes
fix typo and docblock
clarify descriptions
fix typo and fix docblock
more clean ups
remove unused use statements and a line break