Change settings for using default signal graphics and signal recolouring

src/settings_type.h

@@ -124,6 +124,12 @@ enum ViewportScrollMode {
 	VSM_END,                ///< Number of scroll mode settings.
 };
 
+enum ShowSignalDefaultMode {
+	SSDM_OFF,
+	SSDM_ON,
+	SSDM_RESTRICTED_RECOLOUR,
+};
+
 /** Settings related to time display. This may be loaded from the savegame and/or overriden by the client. */
 struct TimeSettings {
 	bool   time_in_minutes;                  ///< whether to use the hh:mm conversion when printing dates
@@ -246,8 +252,8 @@ struct GUISettings : public TimeSettings {
 	bool   show_train_length_in_details;     ///< show train length in vehicle details window top widget
 	bool   show_train_weight_ratios_in_details;   ///< show train weight ratios in vehicle details window top widget
 	bool   show_vehicle_group_in_details;    ///< show vehicle group in vehicle details window top widget
-	bool   show_restricted_signal_default;   ///< Show restricted electric signals using the default sprite
-	bool   show_all_signal_default;          ///< Show all signals using the default sprite
+	bool   show_restricted_signal_recolour;  ///< Show restricted electric signals with recoloured signal post
+	uint8  show_all_signal_default;          ///< Show all signals using the default sprite
 	bool   show_adv_tracerestrict_features;  ///< Show advanced trace restrict features in UI
 	bool   show_progsig_ui;                  ///< Show programmable pre-signals feature in UI
 	bool   show_noentrysig_ui;               ///< Show no-entry signals feature in UI