[2/3] Effects: Add center frequency param to bassboost

Change-Id: I6dd5f68fa859f2be67da82adc2e34d58e4986f64
[1/3] Effects: Add a stereo widening effect
Based on self knowledge.
Aside from the filter, a HighPass method has been
added to Biquad in the DSP library

Change-Id: I587a12abbe3ae808e25ea282f69e3fc5dd709391
Change Icon DSP