matroska: move timeline code to demux/

Separate from previous commit, because git is bad at tracking file
renames when the file contents are also changed.

old-makefile

@@ -172,6 +172,7 @@ SOURCES = audio/audio.c \
           demux/demux_lavf.c \
           demux/demux_mf.c \
           demux/demux_mkv.c \
+          demux/demux_mkv_timeline.c \
           demux/demux_playlist.c \
           demux/demux_raw.c \
           demux/demux_subreader.c \
@@ -218,7 +219,6 @@ SOURCES = audio/audio.c \
           player/scripting.c \
           player/sub.c \
           player/video.c \
-          player/timeline/tl_matroska.c \
           player/timeline/tl_mpv_edl.c \
           player/timeline/tl_cue.c \
           stream/cache.c \

wscript_build.py

@@ -173,6 +173,7 @@ def build(ctx):
         ( "demux/demux_libass.c",                "libass"),
         ( "demux/demux_mf.c" ),
         ( "demux/demux_mkv.c" ),
+        ( "demux/demux_mkv_timeline.c" ),
         ( "demux/demux_playlist.c" ),
         ( "demux/demux_raw.c" ),
         ( "demux/demux_subreader.c" ),
@@ -226,7 +227,6 @@ def build(ctx):
         ( "player/sub.c" ),
         ( "player/timeline/tl_cue.c" ),
         ( "player/timeline/tl_mpv_edl.c" ),
-        ( "player/timeline/tl_matroska.c" ),
         ( "player/video.c" ),
 
         ## Streams