The old struct config_param remains only for top-level string options.

Require the version 2 which has a more sane API.

Don't use GLib.

For free().

Let the caller decide whether to strip.  Only remove \n and \r
(end-of-line markers).

Revert to the old API before commit e9e55b08, removing unnecessary
bloat.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

Replaces the method Close().