Signed-off-by: Pierre d'Herbemont <pdherbemont@videolan.org>

Fixes asserts in directory module.

We need to rework modules/playlist and implement refcounting or proper id management.

playlist: playlist_DeleteInputInParent->playlist_DeleteFromInputInParent to match playlist_DeleteFromInput.

playlist: Use PL_LOCK_IF and PL_UNLOCK_IF to perform some more checks on lock state. And fix a unlocked usage of get_current_status_item().

That may fix or help to fix some input item leaks.

playlist: Don't export playlist_ItemNewFromInput as it is not used, and don't use pl_Yield from here.

This could trigger some interface bugs, especially if they handle their callbacks carelessly. Revert if you have issues, but also consider to fix your interface.

Note that the only aim of this array seems to be counting the non-node items

This improves readability a lot and prevent us from reinventing the wheel.