Removed obsolete LambdaObjectDialog.cpp/hpp, more include cleanups:

BedShapeDialog.hpp (needs not include) OptionsGroup.hpp
Tab.hpp            GUI_App.hpp

src/slic3r/GUI/BedShapeDialog.hpp

@@ -3,7 +3,6 @@
 // The bed shape dialog.
 // The dialog opens from Print Settins tab->Bed Shape : Set...
 
-#include "OptionsGroup.hpp"
 #include "GUI_Utils.hpp"
 #include "2DBed.hpp"
 #include "I18N.hpp"
@@ -14,6 +13,8 @@
 namespace Slic3r {
 namespace GUI {
 
+class ConfigOptionsGroup;
+
 using ConfigOptionsGroupShp = std::shared_ptr<ConfigOptionsGroup>;
 class BedShapePanel : public wxPanel
 {