Options can now return a different value internally to the application

Added a `presentation` method that gets called iff. an option is
accessed via `config.<option>`.

This is useful when we want to store things like '~/Videos'. The change
lets the config file store that version while returning `/home/USER/Videos`
to the application when the dot-notation is used.
Videodir defaults to ~/Videos now
Switched to UNIX line endings