Support Config Files

[julio-salas03]

I recently ran into this tool and it's totally awesome. However I wasn't able to use it since my classes are prefixed with tw-.

A good way to solve this could be allowing users to import their config file, so if they have a custom configuration the app can take it into account.

There are obviously some questions/difficulties, like plugins for example, but maybe supporting a basic config file with no plugins or imports could be a good way to start.