[ticket/12333] Add Template Event overall_header_body_after

PHPBB3-12333
[ticket/12333] Change event name

PHPBB3-12333
[ticket/12338] Add Template Event overall_footer_page_body_after

implement

PHPBB3-12338
Merge remote-tracking branch 'paybas/ticket/12333' into develop-ascraeus

* paybas/ticket/12333:
  [ticket/12333] Change event name
  [ticket/12333] Add Template Event overall_header_body_after
Merge remote-tracking branch 'paybas/ticket/12338' into develop-ascraeus

* paybas/ticket/12338:
  [ticket/12338] Add Template Event overall_footer_page_body_after

Conflicts:
	phpBB/docs/events.md