Live555 Streaming Media Formula

New formula to [primarily] support enhancement to the mplayer formula.

 1. The new formula compiles a version of Live555 Streaming Media that is compatible with mplayer,
 1. Mplayer formula is enhanced with a new `with-livemedia` option to allow people to selectively leverage the new module.
 
Naturally the library resulting from the livemedia formula can be used by other programs as well, but I've only ever seen it used by Mplayer.

Let me know if there's anything about the patch that you feel smells bad. It's a first contribution to this project on my part so I naturally still have a lot to learn regarding <i>best practices</i> and the nuances of how homebrew functions..