feat(editor): docked layout: windows of the editor docked around the 3d view (dockspace over the main window, default layout built when there's none or on Mode windows > Reset window layout), menu shown all the time, toolbar with the edit modes, track and road windows, gizmo operations and the top view, status bar with the outcome of the last operation and the selected node; dockspace submitted also when the frame was started by the ui of another mode, so docked windows don't come undocked on the change of mode; stable ids of the editor windows, no auto resize of the dockable ones; hints of the track and road tools placed in the part of the window the 3d view is seen in; Polish translation

application/uilayer.h

@@ -139,6 +139,8 @@ protected:
    virtual void render_menu_contents();
    ui_log_panel m_logpanel { "Log", true };
 	bool m_suppress_menu = false; // if `true`, the menu at the top of the window will not be present
+	bool m_menu_always = false; // if `true`, the menu is shown all the time, not only when the mouse is at the top of the window
+	int m_dockspaceframe{-1}; // frame the dockspace was last submitted in
 	// progress bar config
 	float m_progress { 0.0f }; // percentage of filled progres bar, to indicate lengthy operations.
 	float m_subtaskprogress{ 0.0f }; // percentage of filled progres bar, to indicate lengthy operations.
@@ -148,6 +150,8 @@ protected:
 // methods
 	// render() subclass details
    virtual void render_() {}
+	// submitted right after the start of the frame, before any window that may be docked in it
+	virtual void render_dockspace() {}
     // draws background quad with specified earlier texture
     void render_background();
     void render_tooltip();