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/libslic3r/Model.hpp

@@ -316,7 +316,7 @@ enum class ModelVolumeType : int {
     SUPPORT_ENFORCER,
 };
 
-enum class ModelObjectCutAttribute : int { KeepUpper, KeepLower, FlipUpper, FlipLower, PlaceOnCutUpper, PlaceOnCutLower, CreateDowels };
+enum class ModelObjectCutAttribute : int { KeepUpper, KeepLower, KeepAsParts, FlipUpper, FlipLower, PlaceOnCutUpper, PlaceOnCutLower, CreateDowels };
 using ModelObjectCutAttributes = enum_bitmask<ModelObjectCutAttribute>;
 ENABLE_ENUM_BITMASK_OPERATORS(ModelObjectCutAttribute);