CutGizmo: Improvements to identify Upper/Lower parts_count

+ Rework CutDialog
+ Added "Cut to" section (Idea from #9564[Cut: Keep results as parts of current idea] was used, but there is other implementation)
+ Fix for #9657 - Inconvenient gizma, blocks the view of the cut of small parts
+ Add functionality "Flip cut plane" = Fix for #9632 - Adding connectors to either split cut part
+ ImGuiWrapper: added tooltip for button

src/slic3r/GUI/ImGuiWrapper.hpp

@@ -91,7 +91,7 @@ public:
     bool begin(const wxString& name, bool* close, int flags = 0);
     void end();
 
-    bool button(const wxString &label);
+    bool button(const wxString &label, const wxString& tooltip = {});
 	bool button(const wxString& label, float width, float height);
     bool button(const wxString& label, const ImVec2 &size, bool enable); // default size = ImVec2(0.f, 0.f)
     bool radio_button(const wxString &label, bool active);