ConstA knob is a plain display value in POIsModuleConfig, at the path its id names: whether
POIs show, and which categories. Not knobs: icon.categoryIcons, which takes images, and events.
How the POIs look — size, zoom, label colours, micro markers — is the pois.*
StylingModule knobs'.
Every POIs knob with its kind, description, options and, where one value holds everywhere, its default. Static data, readable with no map loaded.