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

world/Event.h

@@ -47,6 +47,7 @@ public:
 // destructor
     virtual ~basic_event();
 // methods
+    std::vector<scene::basic_node *> target_nodes() const;
     // restores event data from provided stream
     virtual
     void
@@ -334,6 +335,7 @@ public:
     void init() override;
 
 	std::vector<std::string> dump_children_names() const;
+	std::vector<basic_event *> children() const;
 
 private:
 // types
@@ -699,6 +701,9 @@ public:
 	// returns all eventlaunchers in radius ignoring height
 	std::vector<TEventLauncher *>
 	    find_eventlaunchers(glm::vec2 center, float radius) const;
+	std::deque<basic_event *> const &
+	    sequence() const {
+	        return m_events; }
 	// all event launchers, global ones included
 	std::vector<TEventLauncher *>
 	    launchers() const {