Optimize parameter passing to avoid unnecessary copying

src/graphics/core/Atlas.cpp

@@ -42,7 +42,7 @@ ImageData* Atlas::getImage() const {
     return image.get();
 }
 
-void AtlasBuilder::add(std::string name, std::unique_ptr<ImageData> image) {
+void AtlasBuilder::add(const std::string& name, std::unique_ptr<ImageData> image) {
     entries.push_back(atlasentry{name, std::shared_ptr<ImageData>(image.release())});
     names.insert(name);
 }