Move ColorScheme to its own file

src/visualizer/color_scheme.rs

@@ -0,0 +1,16 @@
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ColorScheme {
+    pub free_color: Color,
+    pub linear_color: Color,
+    pub non_linear_color: Color,
+}
+
+impl Default for ColorScheme {
+    fn default() -> Self {
+        Self {
+            free_color: 0xff9f_9f9f.into(),       // gray
+            linear_color: 0xfffa_ce5b.into(),     // blue
+            non_linear_color: 0xffb8_a9fa.into(), // pink
+        }
+    }
+}

src/visualizer/mod.rs

@@ -1,24 +1,10 @@
 use imgui::*;
 
 mod color;
-pub use color::Color;
-
-#[derive(Clone)]
-pub struct ColorScheme {
-    pub free_color: Color,
-    pub linear_color: Color,
-    pub non_linear_color: Color,
-}
+mod color_scheme;
 
-impl Default for ColorScheme {
-    fn default() -> Self {
-        Self {
-            free_color: 0xff9f_9f9f.into(),       // gray
-            linear_color: 0xfffa_ce5b.into(),     // blue
-            non_linear_color: 0xffb8_a9fa.into(), // pink
-        }
-    }
-}
+pub use color::Color;
+pub use color_scheme::ColorScheme;
 
 pub(crate) trait SubAllocatorVisualizer {
     fn supports_visualization(&self) -> bool {