message: Add MatAdd and MathScale to library header
diff: #include "AudioFilterFreqWeighting_F32.h"
  #include "AudioFilterTimeWeighting_F32.h"
  #include "AudioMixer_F32.h"
  +#include "AudioMathAdd_F32.h"
  #include "AudioMathMultiply_F32.h"
  #include "AudioMathOffset_F32.h"
  +#include "AudioMathScale_F32.h"
  #include "AudioSettings_F32.h"
  #include "FFT_F32.h"
  #include "FFT_Overlapped_F32.h"
  