[ticket/12928] core.mcp_reports_gather_query_before

Adding the core.mcp_reports_gather_query_before
event to mcp backend.

https://tracker.phpbb.com/browse/PHPBB3-12928

PHPBB3-12928
I don't know... If you want me to I can, otherwise I'll just fix the text... I've got to pay more attention to that copy&paste... Too much to keep on my mind (and it's too boring and even more error prone to remake it from 0 every time)