feat(editor): Signals mode of the Tracks window (H): semaphores, block, warning, shunting, stop, substitute signals and repeaters placed by the track from the templates of the scenery, described by //$e signal: (kind, mount, lamps, lean, the event the train reads them by) which tools/editor/signal_headers.py writes into them; a click by a track puts the signal on that side 2.25 m from the axis at the rail heads, facing the trains which have it on their right, a drag along turns it to the trains going the way of the drag; its (p1)_sem_info goes to event1 or event2 of the path, warning signals and repeaters, which the train doesn't read, get none; a head leaning away from the track swapped for its counterpart; the plate named like the signal; signals dragged along the track with their event, removed with it, renamed in the node properties with it, each a single step of the undo history; Polish translation

editor/editorSettings.hpp

@@ -41,12 +41,15 @@ public:
 
 	double platform_edge() const { return m_platform_edge; }
 	void platform_edge(double Distance) { m_platform_edge = Distance; }
+	double signal_offset() const { return m_signal_offset; }
+	void signal_offset(double Distance) { m_signal_offset = Distance; }
 
 private:
 	movement_scheme m_movement{movement_scheme::wsad};
 	orthophoto_settings m_orthophoto;
 	std::map<std::string, std::pair<double, double>> m_orthophoto_origins;
 	double m_platform_edge{1.725};
+	double m_signal_offset{2.25};
 };
 
 // global editor settings instance