Feature request: Dry/Wet mix for all the Sidechain plugins

[Efenstor]

Calf Plugins have a good feature which I miss very much in the LSP plugins: mixing of the sidechain signal done inside the plugin. What's needed is the ability to mix in the Internal input signal with separate settings for the sidechain envelope and the audio. In the UI it could be two additional dials (Sidechain Dry/Wet and Signal Dry/Wet).