ENH: step mesh operation adjustment

1.Put commctrl.h into pch precompilation(OCCT conflicts)

2.Replace input wxWidgets to support loss focus verification(STUDIO-8101)

3.Optimize slider interaction and trigger mesh when push up slider(STUDIO-8099)

4.Optimize step loading method, separate import of step and mesh

5.Fix dialog cancel button logic;

6.mesh tasks into sub-threads to prevent blocking the UI;

JIRA: STUDIO-8101 STUDIO-8099
Change-Id: I50bbb43953a5128f358c6880032d20693531333b
(cherry picked from commit ed7ab6b505a2becf8f38edb3c43b96e51eac3317)

src/slic3r/GUI/Gizmos/GLGizmoBrimEars.hpp

@@ -174,6 +174,8 @@ protected:
     void find_single();
 };
 
+wxDECLARE_EVENT(wxEVT_THREAD_DONE, wxCommandEvent);
+
 } // namespace GUI
 } // namespace Slic3r