New sajax Library, and move...

[jochen]

I updates MythMusicWEB too use a newer sajax library, wich has some bug fixed.

I also moved it to the general includes directory, so that every mythweb module can use it! (cause i want to write a few patches for the tv module wich use sajax!)

[xris]

(In [12614]) sajax updates, re #2947

[xris]

I let the music stuff in because it was a solid unit from a decent third-party application, but the code is messy and undocumented. I'd rather not add that kind of stuff to the rest of MythWeb without some serious cleanup.

If you want php/javascript interaction, I'd be much more in favor of something like the JSON library, which is a lot cleaner, and seemingly integrates with prototype, which is what handles the rest of MythWeb's AJAX stuff.