implements favorites/playlist deletion

QueueCube/Backend/API.swift

@@ -103,6 +103,13 @@ struct API
             .post()
     }
     
+    public func deleteFavorite(mediaURL: String) async throws {
+        try await request()
+            .pathString("/favorites/\(mediaURL.uriEncoded())")
+            .method(.delete)
+            .execute()
+    }
+    
     public func delete(index: Int) async throws {
         try await request()
             .path("/playlist/\(index)")
@@ -214,3 +221,10 @@ struct API
         }
     }
 }
+
+extension String
+{
+    func uriEncoded() -> Self {
+        return addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)!
+    }
+}