feat(scenery): models laid along curves (sweep nodes), bent to follow the paths or repeated along them, loaded and saved with the scenery; trainsets put on a path while the simulation runs; trainset turned around by reversed after its header: the first vehicle stays at the offset and leads towards point 1, the rest stands behind it; launcher keeps reversed trainsets and can turn one around; memory cells saved with the new name of the path they name; events tell their targets and the events of a multiple event; renderer tells whether the cursor is over a surface; vehicle placed in the editor entered when the driving goes on

scene/scene.h

@@ -69,7 +69,9 @@ struct scratch_data {
         std::vector<TDynamicObject *> vehicles;
         std::vector<int> couplings;
         TDynamicObject * driver { nullptr };
+        TTrack * path { nullptr }; // given directly, for a trainset placed in the editor on a path which may have no name
         bool is_open { false };
+        bool reversed { false };
         std::unordered_map<std::string, std::string> assignment;
     } trainset;