Add stringifiers to SenseApi related classes

hcore/senseApis/senseApiManager.cpp

@@ -151,5 +151,14 @@ void SenseApiManager::loadAllSenseApiLibsFromOptions()
     }
 }
 
+std::string SenseApiManager::stringifyLibs() const
+{
+    std::string result;
+    for (const auto& lib : senseApiLibs) {
+        result += lib->stringify() + "\n";
+    }
+    return result;
+}
+
 } // namespace sense_api
 } // namespace hk