Issue #2144919 by yched, fago, effulgentsia, amateescu, tstoeckler, chx, larowlan, swentel: Allow widgets and formatters for base fields to be configured in Field UI.

Issue #2105963 by larowlan, annikaC | vijaycs85: Make sure all YML files in Forum module has no type-casting to string.

Issue #1953528 by swentel, Hydra: Store 'per-bundle view mode settings' in CMI, get rid of field_bundle_settings() & its variable.

Issue #1951268 by larowlan, nick_schuch, jibran, dawehner, alexpott, tim.plunkett: Convert /forum and /forum/% to new routing system, remove forum_forum_load(), forum_get_topics(), create new Forum service.