feat: projects & replace builtins.list with 'base_packs' project property

src/engine/Engine.hpp

@@ -20,6 +20,7 @@ class Screen;
 class ContentControl;
 class EngineController;
 class Input;
+struct Project;
 
 namespace gui {
     class GUI;
@@ -48,6 +49,7 @@ struct CoreParameters {
     std::filesystem::path resFolder = "res";
     std::filesystem::path userFolder = ".";
     std::filesystem::path scriptFile;
+    std::filesystem::path projectFolder;
 };
 
 using OnWorldOpen = std::function<void(std::unique_ptr<Level>, int64_t)>;
@@ -57,6 +59,7 @@ class Engine : public util::ObjectsKeeper {
     EngineSettings settings;
     EnginePaths paths;
 
+    std::unique_ptr<Project> project;
     std::unique_ptr<SettingsHandler> settingsHandler;
     std::unique_ptr<Assets> assets;
     std::shared_ptr<Screen> screen;
@@ -78,6 +81,7 @@ class Engine : public util::ObjectsKeeper {
     void saveSettings();
     void updateHotkeys();
     void loadAssets();
+    void loadProject();
 public:
     Engine();
     ~Engine();