One Property Tree (#500)

* Organize properties in one single property tree
* Update scenes to work with one property tree. Fix documentation issues.

src/scripting/scriptengine.cpp

@@ -573,17 +573,7 @@ std::string ScriptEngine::generateJson() const {
     }
     json << "]";
 
-    std::string jsonString = "";
-    for (const char& c : json.str()) {
-        if (c == '\'') {
-            jsonString += "\\'";
-        }
-        else {
-            jsonString += c;
-        }
-    }
-
-    return jsonString;
+    return json.str();
 }
 
 bool ScriptEngine::writeLog(const std::string& script) {