First, from now on I'm going to call the "SDL2 demo" the "SDL2 bench",
as a demo is software that exists to demonstrate, whereas its purpose
lately has been only fast prototyping, as we switched to make all demo
animations in the Egui port anyway.
Second, I'm removing the SDL2 bench anyway as it's a maintenance burden
that lost its utility. It's also affected by a bug in Pathfinder that
makes it impossible to zoom beyond a certain threshold which would
require someone to dig into Pathfinder's codebase, a task I don't think
anyone is interested in.