When painting a scatter plot we sometimes want to paint hundreds of thousands of points (filled circles) on screen every frame.
In this PR the font texture atlas is pre-populated with some filled circled of various radii. These are then used when painting (small) filled circled, which means A LOT less triangles and vertices are generated for them.
In a new benchmark we can see a 10x speedup in circle tessellation, but the the real benefit comes in the painting of these circles: since we generate a lot less vertices, the backend painter has less to do.
In a real-life scenario with a lot of things being painted (including around 100k points) I saw tessellation go from 35ms -> 7ms and painting go from 45ms -> 1ms. This means the total frame time went from 80ms to 8ms, or a 10x speedup.
`egui_demo_app/lib`: add "About egui" window, and improve mobile layout
This makes the app responsive, removing the side bars on mobile and turning them into drop-down menus instead.
* Make the strip demo less ugly
* revert duplicated windows dependency in Cargo.lock
* cargo update
* Remove duplicated windows dependency by reverting rfd
* And again for parking_lot_core
