Shopping list items can now be checked/unchecked

common/src/ron_api.rs

@@ -19,6 +19,13 @@ pub struct Id {
     pub id: i64,
 }
 
+// A value associated with an id.
+#[derive(Serialize, Deserialize, Clone)]
+pub struct Value<T> {
+    pub id: i64,
+    pub value: T,
+}
+
 #[derive(Serialize, Deserialize, Clone)]
 pub struct Strings {
     pub strs: Vec<String>,