Makie - Observables and removing widgets

Specific Domains Visualization
3

This broke in Makie v0.18, but @sdanisch showed me a better solution:

screen = GLMakie.Screen()
selection = Observable(...)  # this triggers and controls figure (re)construction

on(selection) do selected
    # filter data etc...
    figure = build_figure(data; selection)
    display(screen, figure)
end

notify(selection)
wait(screen)