Issue #2198917 by andypost, Berdir: Use the string field type for the node title field.
Issue #2210197 by sun, longwave: Remove public access to Extension::$type, ::$name, ::$filename.
Issue #2073621 by Cyberschorsch, m1n0: Remove unneeded variables from template_preprocess_maintenance_page().
Issue #2206809 by damiankloip: Convert broken handlers to use a trait.
Issue #2205101 by larowlan: Weird use of globals for table header in Forum.
Issue #2008806 by damiankloip, fubhy: Add getIfOwner(), setIfOwner() and deleteIfOwner() methods to TempStore.
Issue #2192649 by sun, chakrapani, sidharthap: Remove drupal_set_title() from installation and update process.
Revert "Issue #2210197 by sun, longwave: Remove public access to Extension::$type, ::$name, ::$filename." Broke 'drush en simpletest' on testbots

This reverts commit 2c51074d59aee9ae21ee4c8dce41b1453580485e.
Merge remote-tracking branch 'origin/8.x' into rest-url-patterns-2019123