Core functionalities of the library.
* Graph data structures: `GRAFX` and `GRAFXTensor`, and their basic utility functions.
* Audio rendering methods: `render_grafx` and other preparation methods.
* Basic graph visualization tools: `draw_grafx` and other utility functions.
* Differentiable audio processors: `ZeroPhaseFIREqualizer`, `StereoGain`, `SideGainImager`, `ApproxCompressor`, `ApproxNoiseGate`, `MidSideFilteredNoiseReverb`, and `StereoMultitapDelay`.
* Auxiliary processor containers: `DryWet` and `GainStagingRegularization`.