Fixes for version 1.6.2

Fix FFT2R for esp32p4

Added definition for fft4r function for esp32s3 to make it compatible…

… with precompiled libraries.

IIR filters for stereo channel

Release v1.5.2

Release v1.5.1

Release version 1.4.14

Merge branch 'feature/application_spectrum2d' into 'master'

Feature/application spectrum2d

See merge request idf/esp-dsp!113

Release v1.4.0

Release version 1.3.0