Improve storage

CHDataManagement/Generator/HeaderElement.swift

@@ -64,6 +64,21 @@ enum HeaderElement {
             return 102
         }
     }
+
+    var file: FileResource? {
+        switch self {
+        case .icon(let file, _, _):
+            return file
+        case .css(let file, _):
+            return file
+        case .js(let file, _):
+            return file
+        case .jsModule(let file):
+            return file
+        default:
+            return nil
+        }
+    }
 }
 
 extension HeaderElement: Hashable {