update editor & rename 'model' property to 'src'

src/graphics/ui/gui_xml.cpp

@@ -372,7 +372,7 @@ static std::shared_ptr<UINode> read_split_box(
 static std::shared_ptr<UINode> read_model_viewer(
     UiXmlReader& reader, const xml::xmlelement& element
 ) {
-    auto model = element.attr("model", "").getText();
+    auto model = element.attr("src", "").getText();
     auto viewer = std::make_shared<ModelViewer>(
         reader.getGUI(), glm::vec2(), model
     );

src/io/engine_paths.cpp

@@ -192,6 +192,9 @@ std::string EnginePaths::createWriteableDevice(const std::string& name) {
             break;
         }
     }
+    if (name == "core") {
+        folder = "res:";
+    }
     if (folder.emptyOrInvalid()) {
         throw std::runtime_error("pack not found");
     }