Updates to PPC0022 to reflect latest `meta` module

[leonerd]

• Use constructor-method meta::package->get rather than purely functional meta::get_package
• Added meta::glob->get
• Actually specify the "meta::package" and "meta::glob" package names
• All packages exist; ->get will lazily create one. No need for additional ::add_package function
• Added a link to the meta module on metacpan
• Updated (C) year