Update pulseaudio to 6.0 .
* Correct some paths in the default config file (default.pa). 
* Add run depend freedesktop-sound-theme since pulse tries to run these files.
* Add a small patch to allow 24bit audio formats, it not clear why this is
disabled by default. 
* Add pkg-message with instructions how to set input/output channel.
* The kde start script was merged into the normal x11 start script.
PR: 198567 , 
Submitted by: olivierd@ , romain@