message: AudioSettings_F32: refactor to allow default shallow copy by other classes
diff: class AudioSettings_F32 {
  public:
  - AudioSettings_F32(float fs_Hz, int block_size) :
  - sample_rate_Hz(fs_Hz), audio_block_samples(block_size) {}
  - const float sample_rate_Hz;
  - const int audio_block_samples;
  + AudioSettings_F32(void) {
  + sample_rate_Hz = 44100.f;
  + audio_block_samples = 128;
  + }
  + AudioSettings_F32(const float fs_Hz, const int block_size) {
  + sample_rate_Hz = fs_Hz;
  + audio_block_samples = block_size;
  + }
  + float sample_rate_Hz;
  + int audio_block_samples;
  float cpu_load_percent(const int n);
  float processorUsage(void);
  