add generator definition file (.toml)

src/logic/scripting/scripting.hpp

@@ -33,6 +33,7 @@ class LevelController;
 class Entity;
 struct EntityDef;
 class GeneratorScript;
+struct GeneratorDef;
 
 namespace scripting {
     extern Engine* engine;
@@ -147,6 +148,7 @@ namespace scripting {
     void load_entity_component(const std::string& name, const fs::path& file);
 
     std::unique_ptr<GeneratorScript> load_generator(
+        const GeneratorDef& def,
         const fs::path& file
     );