* [EGD-558][fix] change error to info
* [EGD-558] added volume control of currently active audio operation
* [EGD-558] added ringing on incoming call
* [EGD-558] mini clean up in callwindow
* [EGD-558] removed reinterpret_casts and added some logging
* [EGD-558] rewritten methods to increment/decrement volume
* [EGD-558] clean up
* [EGD-558] moved volume control to application class
added nullptr checks
* [EGD-558] fixed types
* [EGD-558] added some audio debug logs
* [EGD-558] left a comment why ringing sound is currently disabled
* [EGD-558] PR fixes
* [EGD-558] PR fix
* [EGD-558] added propper error codes on pointer checking in Audio.cpp
Alek Rudnik