[ticket/13290] Add EVENT index_body_forumlist_body_after

PHPBB3-13290
Merge pull request #3126 from VSEphpbb/ticket/13290

[ticket/13290] Add EVENT index_body_forumlist_body_after
Merge branch 'develop-ascraeus' into develop

Conflicts:
	phpBB/styles/subsilver2/template/index_body.html