Issue #2916740 by chr.fritsch, xjm, Manuel Garcia, tstoeckler, alexpott, seanB, Sam152, amateescu, tim.plunkett, dawehner, larowlan, Berdir: Add generic entity actions

Issue #2825579 by Sam152, timmillwood, gcb: Unable to Publish/Unpublish from Content Admin Screen when content_moderation enabled

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