The Padre::Help class provides a base class, default implementation
and API documentation for help provision support in Padre.
In order to setup a help system for a document type called XYZ one has to do the following:
Create a module called Padre::Help::XYZ that subclasses the Padre::Help module
and override 3 methods: help_init, help_list and help_render.
In the class representing the Document (Padre::Document::XYZ) one should override the
get_help_provider method and return an object of the help provide module.
In our case it should contain
(TO DO: Maybe it should only return the name of the module)
The help_init method is called by the new method of Padre::Help once for every
document of XYZ kind. (TO DO: maybe it should be only once for every document type, and not
once for every document of that type).
help_list should return a reference to an array holding the possible strings the system can
provide help for.
help_render is called by one of the keywords, it should return the HTML to be displayed
as help and another string which is the location of the help. Usually a path to a file
that will be used in the title of the window.