Extend plugin features with expander and gate?

[sadko4u]

I don't see in plugin-features.h that plugin can feature compressor but can not feature gate nor expander. Could be a good idea to add such features?

[sadko4u]

Also I find that generator feature is also missing.

[abique]

What is generator supposed to mean? Is it generating notes? audio?

[robbert-vdh]

Presumably a test tone generator kind of plugin, so something that always generates colored noise or an always on sine wave oscillator.

[abique]

I think generator is too vague

[abique]

Please provide PR for generator with appropriate doc. The right approach may be to divide generator into multiple keywords.