Dynamics Processor (Gate, Compressor & Limiter) for the Teensy Audio Library

my version of MarkzP/AudioEffectDynamics

• removes theoretical divide by zero when rms == 0 (sqrt_uint32(0) will divide by zero, thou it doesnt seem to cause any issues)
• uses running rms calculation and applies gain per sample instead of rms calculation per audio block and applying a constant gain to entire audio buffer
• adds some build stuff