Patch for IP-DSCP Prioritization

[ExSport]

The patch was applied in r573 but we had to remove it in r585 because it was causing at least one renderer (Sony Bravia Z5500) to not work with PMS (#1042)
If you have an updated patch that could fix that I will reconsider adding it

What about to make it configurable so it can be enabled or disabled when needed.
Maybe Sony Bravia Z5500 wasn't working also due to other bugs in PMS which are now maybe fixed so we can test it again easily by enabling/disabling it without any recompilation.

[SubJunk]

Well the other developers have started working with GitHub and I don't know if I can be bothered doing that so I suspect my time on this project is coming to an end. Maybe someone else can do it.

[mazey]

googlecode > github. just keep doing what ure doing subjunk ure one of the main developers those guys r just well new haha.. 1.50 is working perfectly for me it took awhile but u finnaly got there. as far as i can see you and you alone fixed all the problems i was having..