[ticket/13409] Add event core.search_modify_param_before

PHPBB3-13409
[ticket/13409] Fix event name

PHPBB3-13409
[ticket/13409] Change search_id type and release version

PHPBB3-13409
Merge pull request #3216 from kinerity/ticket/13409

[ticket/13409] Add event core.search_modify_param_before