wip: checkpoint multi-game core work

src/models/card.rs

@@ -13,6 +13,20 @@ pub enum Rarity {
     Icon,
 }
 
+impl Rarity {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Rarity::Bronze => "bronze",
+            Rarity::Silver => "silver",
+            Rarity::Gold => "gold",
+            Rarity::RareGold => "raregold",
+            Rarity::Totw => "totw",
+            Rarity::Hero => "hero",
+            Rarity::Icon => "icon",
+        }
+    }
+}
+
 /// A card definition loaded from JSON data files.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct CardDefinition {