Ahead chunks now equals network-caching

We'll need to split single file, ranged chunks

List was not returned by reference

Prevent the es_out from overriding the NowPlaying state by splitting
the meta into NowPlaying and ESNowPlaying.

The function input_item_GetNowPlayingFb can be used to return the
preferred meta value.

Closes #11877

This led to a random crash when resizing video on a small display (or when
resizing small video).
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>