Blender AgX in darktable (proof of concept)

[kofa (István Kovács)]

Agx terminology (UI)

Now for something completely different (we’ve shifted a bit from UI and terminology): my PR for the power → brightness and offset → lift change has been merged (thanks, @Pascal_Obry). It will perform a DB migration to convert the power to brightness in history stacks and presets. The scene-referred default and the blender-like presets partially restore purity, as before, and they don’t restore rotations, as before. However, how they don’t restore rotations has changed. Previously…