playlist: add DEMUX_BY_EXTENSION_OR_BY_MIMETYPE

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
xspf: add MIME detection

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
directory: add support for ACCESS_GET_CONTENT_TYPE

Remove the psz_demux hack.

Ref #8449

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
dvb: remove psz_demux hack

Ref #8449

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
http: remove unneeded xspf hack

Ref #8449

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>