* develop-ascraeus:
[ticket/12920] Add missing comma
[ticket/12920] Update composer.lock file after update nothing
[ticket/12920] Fix sh syntax error in post-update-cmd script
[ticket/12920] Remove incorrect @ from self.version reference in composer.json
[ticket/12920] Output warning message about vendor cleaning target
[ticket/12920] Turn phpBB composer.json into publishable full version
[ticket/12920] Add require for minimum php version
[ticket/12920] Add composer.json for phpbb/phpbb-core library