[ticket/13124] Also trim spaces in front of comments except for first line

PHPBB3-13124
[ticket/13124] Fix tests for event exporter

PHPBB3-13124
[ticket/12530] Fix captcha challange image breaking responsive layout

PHPBB3-12530
[ticket/12530] Show logo and policy in responsive

PHPBB3-12530
[prep-release-3.1.0-RC5] Update version to 3.1.0-RC5
[prep-release-3.1.0-RC5] Add migration for 3.1.0-RC5
[prep-release-3.1.0-RC5] Prepare Changelog
[prep-release-3.1.0-RC5] Add changelog for 3.1.0-RC5
[prep-release-3.1.0-RC5] Update phpBB Version for RC6 development
Merge branch 'prep-release-3.1.0-RC5' into develop-ascraeus
[ticket/13124] Add another test case as requested

PHPBB3-13124
[ticket/13164] Update post_visibility before event is triggered

PHPBB3-13164
[ticket/13161] Avoid problems when running tests with different migrations

PHPBB3-13161
[ticket/13161] Check whether the schema exists, before deleting it

PHPBB3-13161
Merge pull request #3029 from nickvergessen/ticket/13161

Ticket/13161 PHP Warnings issued from phpbb database test case

* nickvergessen/ticket/13161:
  [ticket/13161] Check whether the schema exists, before deleting it
  [ticket/13161] Avoid problems when running tests with different migrations
[ticket/13164] Add post_visibility to core.submit_post_end event

PHPBB3-13164
[ticket/13164] Fix syntax error

PHPBB3-13164
[ticket/13163] Fix responsive link lists

PHPBB3-13163
[ticket/13163] Terminate timely when no data-last links exist

PHPBB3-13163
[ticket/13174] Add missing closing </div> to ucp_pm_viewmessage

PHPBB3-13174