rework if-elif pattern to load mapdict

[stefanfluck]

Not flexible when adding new dialects. Maybe read in module name and improt with importlib?

https://stackoverflow.com/questions/13598035/importing-a-module-when-the-module-name-is-in-a-variable https://www.oreilly.com/library/view/python-cookbook/0596001673/ch15s04.html

[stefanfluck]

possible solution in #39