Function shutdown

src/Audio/src/AudioEngine.cpp:203–218

    }

    void shutdown()
    {
        for (auto& sourceId : _alSources)
        {
            alSourceStop(sourceId);
            alSourcei(sourceId, AL_BUFFER, 0);
        }
        _instances.clear();

        alDeleteSources(static_cast<ALsizei>(_alSources.size()), _alSources.data());
        _alSources.clear();
        alDeleteBuffers(static_cast<ALsizei>(_alBuffers.size()), _alBuffers.data());
        _alBuffers.clear();
        closeDevice();
        _isInitialised = false;
    }

    // Buffer management