Issue #2080823 by alexpott, swentel, Wim Leers: Create API to discover content or config entities' soft dependencies and use this to present a confirm form on module uninstall.

Issue #2143519 by yched, Wim Leers: Allow FieldInstance yml files to refer to the Field by field name rather than by field_uuid.

Revert "Issue #2143519 by yched: Allow FieldInstance yml files to refer to the Field by field name rather than by field_uuid."

This reverts commit f2e66e87.

Issue #2143519 by yched: Allow FieldInstance yml files to refer to the Field by field name rather than by field_uuid.

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.