Add a configuration section that lists all options for each plugin.
List options in alphabetic order.
Mention the default value for each option.
Use same sentences to describe concepts common to different plugins eg 'auto
option, install description
This commit changes the output of the play plugin to always use files instead of folders when generating a playlist when using the `-a` option. A new `use_folders` option was added to preserve the old behavior for anyone who wishes it.
