the Outliner
Channels which can be renamed include:
- Scenes, Objects, World, Material, Texture, etc. (i.e. "ID-blocks",
or the dark and light blue channels)
- Action Groups (green channels)
- Action expanders (i.e. "CubeAction", "WorldAction", etc.)
- Grease Pencil stuff
Channels which CANNOT be renamed, as they mostly use hardcoded values
or otherwise include:
- Drivers expander
- FCurves (they don't technically have a "name"; what is shown is just
a user-friendly representation of their rna_paths)