Issue #1962846 by andypost, Wim Leers, InternetDevels: Use field instance name for header of comment list, drop comment-wrapper template.
Issue #2301313 by pwolanin, dawehner, Wim Leers, effulgentsia, kgoel, YesCT, glide: MenuLinkNG part3 (no conversions): MenuLinkContent UI.
START PART 4: https://www.drupal.org/node/2301317
apply patch https://www.drupal.org/files/issues/menu-2256521-conversion-review-do-not-test.patch
and resolve 8.x conflicts
fix hook_uninstall to use the correct service
rename updateLink to updateDefinition
rename deleteLink to removeDefinition
rename isResetable() to isResettable()
convert topLevelOnly() to setTopLevelOnly()
fix destination
another destination fix
partial test fix
rename yml files
add back system block caching
don't eanble menu_link module per Alex
move SafeMarkup fix to part4
reference https://www.drupal.org/node/2306991
Step 4: Add punctuation to sentence in MenuLinkEditForm.
remove stray methods that aren't actually part of MenuLinkInterface