[ticket/12273] Verify that the events are still in the named files

PHPBB3-12273
[ticket/12273] Fix some locations of existing events

PHPBB3-12273
[ticket/12273] Only check selected files

PHPBB3-12273
[ticket/12273] Verify the result of the .md file to the source

PHPBB3-12273
[ticket/12273] Test source files and compare with events.md

PHPBB3-12273
[ticket/12273] Fix method name of test and fix undefined index

PHPBB3-12273
[ticket/12273] Fix subsilver2 missing from simple_footer_after docs

PHPBB3-12273
[ticket/12273] Fix number of = in events.md

PHPBB3-12273
[ticket/12273] Add missing event documentation

PHPBB3-12273