initialise your plugin. Always call super if you override this method, as important variables are set up for you

return a help string for your module. for complex modules, you may wish to break your help into topics, and return a list of available topics if topic is nil. plugin is passed containing the matching prefix for this message - if your plugin handles multiple prefixes, make sure you return the correct help for the prefix requested

return an identifier for this plugin, defaults to a list of the message prefixes handled (used for error messages etc)

register the plugin as a handler for messages prefixed name this can be called multiple times for a plugin to handle multiple message prefixes

default usage method provided as a utility for simple plugins. The MessageMapper uses ‘usage’ as its default fallback method.