* Added 6 dB/octave and 18 dB/octave crossover filters for Deesser plugin series.
* Replaced linear phase crossover implementation by more accurate one for Deesser plugin series.
* Fixed behavior of the Input signal gain knob with the Bypass switch in the Deesser plugin series.

* Fixed implementation of LR2 filters in the crossover which caused some kind of phase distortion. The previous implementation (special PD2 mode) has been kept for backwared compatibility.

* Fixed bug in DSP code that could cause a crash of Clipper and Multiband Clipper plugin series on processors with AVX-512 instruction set support when setting any of DC Offset parameters to the non-default value.

- Move multiband plugins to dspu::Crossover usage:
  - GOTT Compressor;
  - Multiband Compressor;
  - Multiband Dynamics Processor;
  - Multiband Expander;
  - Multiband Gate;
  - Multiband Limiter.
* Added Minimum Phase filter support by following plugins:
  * Filter;
  * Graphic Equalizer;
  * Referecer;
  * Parametric Equalizer.

* Fixed regression in the Dynamics Processor module which could produce NaN (not-a-number) values.

* Updated behavior of A/B preset switch in the UI: A and B presets are swapped when switching between them. That makes the UI usage more comfortable: no need to move mouse pointer to perform the A -> B -> A switch order.

* Reduced latency for IIR filter modes by using zero-latency convolver module in
  the following list of plugin series:
  * Graphic equalizer;
  * Filter;
  * Parametric Equalizer.

* Added Kaiser and Kaiser-Bessel Derived windows to Spectrum Analyzer and Referencer plugin series.
* Improved Spectrum processing modules in the DSP libraries by utilizing Kaiser-Bessel Derived windows instead of Cosine windows.

* Added built-in presets for Multiband Compressor plugin serites (contributed by mene311 @ github.com).

* Fixed bugs in 3D rendering OpenGL backends for Linux/FreeBSD (lsp-r3d-glx-lib) and Windows (lsp-r3d-wgl-lib).