Feature: Hide block signals in GUI by default (#8688)

src/rail_gui.h

@@ -19,4 +19,16 @@ void ResetSignalVariant(int32 = 0);
 void InitializeRailGUI();
 DropDownList GetRailTypeDropDownList(bool for_replacement = false, bool all_option = false);
 
+/** Settings for which signals are shown by the signal GUI. */
+enum SignalGUISettings : uint8 {
+	SIGNAL_GUI_PATH = 0, ///< Show path signals only.
+	SIGNAL_GUI_ALL = 1,  ///< Show all signals, including block and presignals.
+};
+
+/** Settings for which signals are cycled through by control-clicking on the signal with the signal tool. */
+enum SignalCycleSettings : uint8 {
+	SIGNAL_CYCLE_PATH = 0, ///< Cycle through path signals only.
+	SIGNAL_CYCLE_ALL = 1,  ///< Cycle through all signals visible.
+};
+
 #endif /* RAIL_GUI_H */