Change sound backend from Qt to miniaudio (#4334)

Thanks Greenlandicsmiley, Nerixyz, Yoitsu, and helmak for helping debug & test this

* Remove QMediaPlayer includes

* Prefer local path when generating the sound path

* Update changelog entry number

* Disable pitch & spatialization control

src/providers/twitch/TwitchMessageBuilder.cpp

@@ -35,7 +35,6 @@
 #include <boost/variant.hpp>
 #include <QColor>
 #include <QDebug>
-#include <QMediaPlayer>
 #include <QStringRef>
 
 namespace {