Create asset menu item for SwfSettings

Assets/FlashTools/Scripts/FTRuntime/SwfSettings.cs

@@ -57,6 +57,10 @@ namespace FTRuntime {
 		}
 	}
 
+	[CreateAssetMenu(
+		fileName = "SwfSettings",
+		menuName = "FlashTools/SwfSettings",
+		order = 100)]
 	public class SwfSettings : ScriptableObject {
 		public SwfSettingsData Settings;