Improve the look of thin lines, making them look weaker (#2437)

* Revert "fix all clippy lints and remove them from allow list in cranky (#2419)"

This reverts commit 930ef2db38.

* Explain the cranky lints better

* Add Color32::gamma_multiply

* Remove unused pub use

* Remove non-existing crate category

* Improve color test with more lines

* Improve the look of thin lines, making them look weaker

Before they looked were too strong for the thickness.

* Use asserts for shader compilations

* Update changelogs

crates/eframe/src/web/backend.rs

@@ -2,7 +2,6 @@ use egui::{
     mutex::{Mutex, MutexGuard},
     TexturesDelta,
 };
-pub use egui::{pos2, Color32};
 
 use crate::{epi, App};