move manageaudio to c++
Summary: move the manageaudioplayer class to c++. with this, the main files responsible for playing audio are now in c++ only, with more to follow
Test Plan: audio still plays
Reviewers: Elisa, mgallien
Reviewed By: Elisa, mgallien
Tags: Elisa
Differential Revision: https://phabricator.kde.org/D11678