Romain Vimont authored Dec 11, 2018 and Thomas Guillem committed Jan 08, 2019

Expanding an item (replacing it by its subitems) was implemented in
preparse.c, essentially because it's only used for preparsing.

For consistency, implement all functions changing the content of the
playlist in content.c. This avoids to expose internal functions
like vlc_playlist_ItemsInserted().

Signed-off-by: Thomas Guillem <thomas@gllm.fr>