initialize the plugin, automatically called during the core initialization process
finishPlugin
finish the plugin and the core if it has been used,
automatically called during the core initialization process
ObjectMethod beforeSaveHandler()
getCore() → $core
returns a singleton Foswiki::Plugins::CaptchaPlugin::Core object for this plugin; a new core is allocated
during each session request; once a core has been created it is destroyed during finishPlugin()