lua: http: fix artwork not being displayed on windows.

Close #7607

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
android: implement subtitles rendering for Android MediaCodec opaque direct rendering

A blending filter is used on the subtitles surface above the main one by wrapping the corresponding NativeWindow into a picture_t.

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