Add isolation list to track tooltips

If a track is hovered when debug mode is on, it will now also show the names of isolated circuits the track belongs to, if any.

Track.cpp

@@ -2364,6 +2364,19 @@ TTrack::export_as_text_( std::ostream &Output ) const {
         << "\n";
 }
 
+// Returns the tooltip of this Track, which may contain a list of isolations if the track belongs to any.
+std::string TTrack::tooltip() const
+{
+	std::string tooltip = this->name();
+	if (!Isolated.empty())
+	{
+		tooltip += "\nIsolated:";
+		for (const auto isolation : Isolated)
+			tooltip += " " + isolation->asName;
+	}
+	return tooltip;
+}
+
 // locates specified profile in the profile database, potentially loading it from a file
 // returns: pair <profile name, profile handle>
 std::pair<std::string, int>

Track.h

@@ -316,6 +316,7 @@ public:
     void ConnectionsLog();
     bool DoubleSlip() const;
     static void fetch_default_profiles();
+	std::string tooltip() const override;
 
 private:
 // types

drivermode.cpp

@@ -341,12 +341,10 @@ driver_mode::update() {
                     set_tooltip( ( cabcontrol ? cabcontrol->pName : "" ) );
                 }
             }
-            if( ( true == Global.ControlPicking ) && ( true == FreeFlyModeFlag ) && ( true == DebugModeFlag ) ) {
-                auto const scenerynode = GfxRenderer->Pick_Node();
-                set_tooltip(
-                    ( scenerynode ?
-                        scenerynode->name() :
-                        "" ) );
+        	if( Global.ControlPicking && FreeFlyModeFlag && DebugModeFlag ) {
+        		const auto sceneryNode = GfxRenderer->Pick_Node();
+        		const std::string content = sceneryNode ? sceneryNode->tooltip() : "";
+        		set_tooltip(content);
             }
 
             runonce = true;

editoruilayer.cpp

@@ -30,14 +30,10 @@ editor_ui::update() {
 
     set_tooltip( "" );
 
-    if( ( true == Global.ControlPicking )
-     && ( true == DebugModeFlag ) ) {
-
-        auto const scenerynode = GfxRenderer->Pick_Node();
-        set_tooltip(
-            ( scenerynode ?
-                scenerynode->name() :
-                "" ) );
+    if( Global.ControlPicking && DebugModeFlag ) {
+        const auto sceneryNode = GfxRenderer->Pick_Node();
+		const std::string content = sceneryNode ? sceneryNode->tooltip() : "";
+        set_tooltip(content);
     }
 
     ui_layer::update();

scenenode.h

@@ -330,6 +330,7 @@ public:
         export_as_text( std::string &Output ) const;
     std::string const &
         name() const;
+	virtual std::string tooltip() const;
     void
         location( glm::dvec3 const Location );
     glm::dvec3 const &
@@ -379,6 +380,13 @@ basic_node::name() const {
     return m_name;
 }
 
+// Returns the tooltip of this Node when hovered with the mouse cursor.
+inline
+std::string basic_node::tooltip() const
+{
+	return m_name;
+}
+
 inline
 void
 basic_node::location( glm::dvec3 const Location ) {