Made accessor for lines

src/modules/stream/road_lines_data.h

@@ -25,6 +25,8 @@ public:
 				      const Dictionary &from);
 		Dictionary to_dict() const;
 	};
+
+private:
 	struct line_segment {
 		Vector3 p1;
 		Vector3 p2;
@@ -33,6 +35,8 @@ public:
 		Vector3 tangent;
 		float offset;
 	};
+
+public:
 	struct road_line {
 		std::vector<Transform> points;
 		std::vector<int> indices;
@@ -44,14 +48,28 @@ public:
 		Dictionary metadata;
 		_Signal<void> line_updated;
 	};
+
+public:
 	static ImmediateGeometry *get_debug_node();
-	HashMap<String, struct road_line> lines;
+
+private:
 	HashMap<String, Ref<Curve3D> > curves;
+
+public:
+	const struct road_line &get_line(const String &key) const;
+	struct road_line &get_line(const String &key);
+	const struct road_line &lines(const String &key) const;
+	struct road_line &lines(const String &key);
+	bool has_line(const String &key);
+
 	static RoadLinesData *get_singleton();
 	virtual ~RoadLinesData();
 	static void cleanup();
 	String get_road_lines_path();
 	void get_road_lines_key_list(List<String> *keys);
+	void get_lines_key_list(List<String> *keys);
+	const String &get_next_line(const String &key);
+	void erase_line(const String &key);
 	void load_data();
 	void save_data();
 	void process_lines(std::unordered_map<uint32_t, std::vector<Vector3> >