* github-nickvergessen/ticket/12273: (55 commits)
[ticket/12273] Move $extension to constructor so the path is always set
[ticket/12273] Find events.md relative from the path not the phpbb root
[ticket/12273] Do not look in extensions docs/ and tests/ directory
[ticket/12273] Also check file for adm "Location:" events
[ticket/12273] Do not allow template events in non-html files
[ticket/12273] Fix return description
[ticket/12273] Update exporter to allow specifying an extension
[ticket/12273] Allow to filter events for extensions
[ticket/12273] Remove old parameter from function call
[ticket/12273] Fix table header for adm events
[ticket/12273] Add root path to recursive_event_filter_iterator
[ticket/12273] Fix missing classes in export_events_for_wiki.php
[ticket/12273] Use RecursiveDirectoryIterator with filter in php_exporter
[ticket/12273] Use RecursiveDirectoryIterator in md_exporter
[ticket/12273] Fix doc blocks
[ticket/12273] Do not allow 3.1-A1 for template events
[ticket/12273] Sort arguments alphabetically before exporting
[ticket/12273] Do not allow 3.1-A1 version
[ticket/12273] Update since version to 3.1.0-a* style
[ticket/12273] Update existing events
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