feat: new block custom models implementation (WIP)

src/engine.cpp

@@ -286,6 +286,18 @@ void Engine::loadAssets() {
     assets = std::move(new_assets);
     
     if (content) {
+        for (auto& [name, def] : content->blocks.getDefs()) {
+            if (def->model == BlockModel::custom) {
+                assets->store(
+                    std::make_unique<model::Model>(
+                        ModelsGenerator::loadCustomBlockModel(
+                            def->customModelRaw, *assets, !def->shadeless
+                        )
+                    ),
+                    name + ".model"
+                );
+            }
+        }
         for (auto& [name, def] : content->items.getDefs()) {
             assets->store(
                 std::make_unique<model::Model>(