Issue #2056895 by tim.plunkett, xjm: Fixed Routes with optional placeholders can fatal when placed in a menu.
Change ->vid to ->getRevisionId()
Change ->created to getCreatedTime()
Change ->changed to getChangedTime()
Replace ->type with ->bundle()
Replace ->title with getTitle()
Converted node.html.twig files
Replace ->langcode with ->language()->langcode and similar.
Replace ->uid with getAuthor*()
Convert ->status to ->isPublished()
Convert ->sticky to ->isSticky()
Change ->promote to ->isPromoted
more id() fixes
langcode fixes
re-add ng entity call
amateescu fixes
comment and forum fixes
remove user_load()
fix setPromoted and demote action
simplify author methods