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/ecolor/src/lib.rs

@@ -100,7 +100,7 @@ fn fast_round(r: f32) -> u8 {
 pub fn test_srgba_conversion() {
     for b in 0..=255 {
         let l = linear_f32_from_gamma_u8(b);
-        assert!((0.0..=1.0).contains(&l));
+        assert!(0.0 <= l && l <= 1.0);
         assert_eq!(gamma_u8_from_linear_f32(l), b);
     }
 }