Add support for CHG_COLCON to spumux

[silid]

Hi, Thanks for taking leadership of this project.
Please could you consider adding support for CHG_COLCON to spumux
I suggest that the xml take the form of something like this:

...

See:
http://www.wipo.int/pctdb/images4/PCT-PAGES/2001/282001/01050732/01050732.pdf
http://dvd.sourceforge.net/dvdinfo/spu.html