git is the source of truth for the copyright, copyrite (the tool)
was taking exponentially longer with each release, and it's
polluting the code with sometime as much as 50 lines of names.
add mermaid js printer, fix accepted output format without graphviz
Make an adapter for package graph, use class until mermaid don't
add a package diagram type. Add mmd and html formats to additional commands
* Extract helper method to get annotated arguments into ``Printer`` base class.
* Add ``Printer`` subclass for PlantUML output
* Add functional test for ``PlantUmlPrinter``
* Add tests for specific layout for ``PlantUmlPrinter``
* Extract test helper function to remove code duplication
* Add new test class to check type annotations
* Cleanup generated .puml files after tests finished
* Create a factory function to get the correct ``Printer`` class for a given filetype.
* Fix unittest after adding a new class to the test data.
* Add changelog and whatsnew entry
* Add "plantuml" as possible extension for PlantUML output
