Issue #2890364 by timmillwood, amateescu, plach, xjm: Replace all uses of "forward revision" with "pending revision"

Issue #2766957 by timmillwood, vijaycs85, plach, Sam152, Gábor Hojtsy, catch, dawehner, alexpott, hchonov: Forward revisions + translation UI can result in forked draft revisions

Issue #2883868 by amateescu, Sam152, timmillwood, plach: Content Moderation decides to set a new revision as the default one way too late in the entity update process

Issue #2779647 by alexpott, Sam152, catch, scookie, yoroy, pericxc, timmillwood, tacituseu, jhedstrom, xjm, bojanz, tstoeckler: Add a workflow component, ui module, and implement it in content moderation

catch authored Aug 17, 2016 and Alex Pott committed Aug 17, 2016

(cherry picked from commit 0d00a94b139602d9280360dc2977dbc989c6ef1e)
(cherry picked from commit 04abf4c0)

Issue #2725533 by timmillwood, alexpott, amateescu, webchick, dixon_, larowlan, dawehner, catch, Crell, Bojhan, jibran, Wim Leers, agentrickard, Berdir: Add experimental content_moderation module