Improve ActivityStream objects

- Add optional fields
- Parse json correctly
- Add print helper

dub.selections.json

@@ -11,6 +11,7 @@
 		"httparsed": "1.2.1",
 		"mysql-native": "3.1.0",
 		"odbc": "1.0.0",
+		"openssl": "3.3.3",
 		"path-matcher": "1.1.4",
 		"requests": "2.1.3",
 		"slf4d": "3.0.0",