Introduce Refinement trait and derive macro

crates/refineable/src/refineable.rs

@@ -0,0 +1,13 @@
+pub use derive_refineable::Refineable;
+
+pub trait Refineable {
+    type Refinement;
+
+    fn refine(&self, refinement: &Self::Refinement) -> Self;
+    fn from_refinement(refinement: &Self::Refinement) -> Self
+    where
+        Self: Sized + Default,
+    {
+        Self::default().refine(refinement)
+    }
+}