[ticket/13072] Add total_match_count to core.search_get_topic_data event

PHPBB3-13072
[ticket/13072] Added '@changed 3.1.0-RC5 Added total_match_count'

PHPBB3-13072
Merge pull request #2979 from blitze/ticket/13072

[ticket/13072] Add total_match_count to core.search_get_topic_data event
Merge branch 'develop-ascraeus' into develop