- Fixed the size for tx3g samples in muxmp4.c I forgot to add the size of the string...

- Fixed the size for tx3g samples in muxmp4.c I forgot to add the size of the string byte count to the total sample size.
- Small fixes in deccc608sub.c, trim null characters away.
- Moved the duration time from hb_mux_object_s to hb_mux_data_s so that multiple subtitle tracks can be muxed with interference.
- Uses par to calculate the subtitle track width so that It will be the same as the video track.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@2406 b64f7644-9d1e-0410-96f1-a4d463321fa5