New batch of Theme bugfix, see issue #3446 (still WIP)

rtgui/toolpanel.h

@@ -43,23 +43,15 @@ public:
 /// @brief This class control the space around the group of tools inside a tab, as well as the space separating each tool. */
 class ToolVBox : public Gtk::VBox
 {
-private:
-    void updateStyle();
-
 public:
     ToolVBox();
-    void on_style_updated ();
 };
 
 /// @brief This class control the space around a tool's block of parameter. */
 class ToolParamBlock : public Gtk::VBox
 {
-private:
-    void updateStyle();
-
 public:
     ToolParamBlock();
-    void on_style_updated ();
 };
 
 class ToolPanel