Remove all the code related to list subclasses.
Remove all the code related to list subclasses.

kikocorreoso/brython,kikocorreoso/brython,jonathanverner/brython,Hasimir/brython,jonathanverner/brython,jonathanverner/brython,brython-dev/brython,brython-dev/brython,jonathanverner/brython,Hasimir/brython,brython-dev/brython,Hasimir/brython,Hasimir/brython,kikocorreoso/brython