Issue #2028025 by David Hernández, Berdir, larowlan, ceng, YesCT, a_thakur: Expand CommentInterface to provide methods.

Issue #2078387 by Xano, andypost, twistor, splatio, InternetDevels, amateescu, Berdir, larowlan, vladan.me: Add an EntityOwnerInterface.

Issue #1938062 by dawehner, tstoeckler, slashrsm, tim.plunkett, olli, pcambra, YesCT, damiankloip: Convert the recent_comments block to a view.

Revert "Issue #2020395 by dawehner, oadaeh, mr.baileys, jibran, Andi-D: Convert 'Who's new' block to a View."

This reverts commit f7e75db7.

Issue #2020395 by dawehner, oadaeh, mr.baileys, jibran, Andi-D: Convert 'Who's new' block to a View.

Issue #2091139 by mcrittenden, cosmicdreams: Fixed Duplicate array key comment_changed() in DefaultViewRecentComments.

Issue #2100329 by cosmicdreams: Use \Drupal instead of Drupal to make IDEs and static code analyse tools happy.

Issue #731724 by larowlan, andypost, dixon_, tsvenson: Convert comment settings into a field to make them work with CMI and non-node entities.

Issue #1999328 by DmitryDrozdik, annikaC, jeroen12345, andypost: Remove comment_save() and comment_delete()/comment_delete_multiple() in favor of $comment->save()/$comment->delete().

Issue #1498674 by plach, das-peter, Schnitzel, dawehner, YesCT, attiks, Berdir, Gábor Hojtsy, Soul88, Carsten Müller: Refactor node properties to multilingual.

Issue #1801304 by Amitaibu, amateescu, effulgentsia, tim.plunkett, EclipseGc, Fabianx, Cottser: Added Entity reference field.

Issue #1778178 by fago, Berdir, effulgentsia, mradcliffe, das-peter: Convert comments to the new Entity Field API.