[ticket/12801] Add topic_poster to load_drafts' topics query

PHPBB3-12801
[ticket/12801] Add core.functions_posting.load_drafts_draft_list_results

Adding event core.functions_posting.load_drafts_draft_list_results

PHPBB3-12801
[ticket/12801] missing $phpbb_dispatcher as a global

PHPBB3-12801
[ticket/12801] Changed name change @since as requested

Changed name to core.load_drafts_draft_list_result as requested

Changed @since to 3.1.0-RC3 because RC2 is already out.

PHPBB3-12801
Merge remote-tracking branch 'brunoais/ticket/12801' into develop-ascraeus
Merge branch 'develop-ascraeus' into develop