Make Custom GCode Editor resizable (#9405)

* Make gcode editor window resizable

* Make param list expands with the window

* Make dialog shrinkable and give it a proper initial size

* Revert "Hardcode Location of Add Button"

This reverts commit aef74ab005.

* Make sure the dialog fits inside current screen

* Fix compile error

src/slic3r/GUI/GUI_Utils.hpp

@@ -498,6 +498,12 @@ int get_dpi_for_window(const wxWindow *window);
 void dataview_remove_insets(wxDataViewCtrl* dv);
 #endif
 
+/// <summary>
+/// Make sure the given window fits inside current display
+/// </summary>
+void fit_in_display(wxTopLevelWindow& window, wxSize desired_size);
+
+
 }}
 
 #endif