Move pulseaudio-qt to Extragear

[Nicolas Fella]

Hi,

together with David Rosca and Aleix Pol I have worked on extracting the 
libpulse abstraction from plasma-pa into a library [0][1]. It is 
currently optionally required by KDE Connect. plasma-pa and 
libtaskmanager will use it at some point in the future. Long-term plan 
is to move it to Frameworks, but until the required documentation and 
testing is done I'd like to move it to Extragear and make an initial 
release.

Cheers

Nicolas

[0] https://phabricator.kde.org/T7994

[1] https://cgit.kde.org/pulseaudio-qt.git