Fix: resolve 23 MSVC compiler warnings (#15280)

* fix: resolve MSVC compiler warnings and build error

C4101 - unreferenced local variables:
  - STEP.cpp, FilamentGroup.cpp: remove unused catch variable 'e'
  - GLGizmoMeasure.cpp: remove unused 'direction_on_model'
  - PartPlate.cpp: remove unused 'origin1, origin2'
  - DevStatus.cpp: suppress unused 'e' via (void)e

C4005 - macro redefinition:
  - Wrap NOMINMAX defines in #ifndef guards (OrcaSlicer.cpp, Preset.cpp,
    SupportTreeBuilder.cpp, OpenVDBUtils.cpp, GUI.cpp)
  - Remove conflicting DESIGN_INPUT_SIZE redefine in DownloadProgressDialog.cpp

C4172 - return address of local/temporary:
  - Config.cpp: return static const double instead of temporary 0

C4996 - deprecated API usage:
  - ImGuiWrapper.cpp: use GetText().Length() instead of GetTextLength()
  - OrcaCloudServiceAgent.cpp: replace deprecated wxPATH_NORM_ALL with
    explicit flags matching old default behavior
  - ASCIIFolding.cpp: replace deprecated std::wstring_convert/codecvt_utf8
    with boost::locale::conv::utf_to_utf (already used in same function)

C2440 - build error from deprecated wxTipWindow constructor:
  - Button.hpp/cpp: replace raw wxTipWindow* with wxTipWindow::Ref (weak
    reference). Ref auto-nulls when the tip window closes, eliminating
    the manual Bind(wxEVT_DESTROY) handler. delete uses operator->() to
    access the raw pointer since Ref is non-owning

* fix: avoid duplicate GetText() call in ImGuiWrapper clipboard handler

Capture wxTextDataObject::GetText() result in a local variable instead
of calling it twice (for .Length() check and into_u8()). GetText()
returns wxString by value, so this avoids an extra allocation/copy.

* fix: resolve MSVC compiler warnings (code review fixes)

* fix: resolve MSVC compiler warnings (code review fixes)

src/libslic3r/Config.cpp

@@ -2031,7 +2031,8 @@ const double& DynamicConfig::opt_float(const t_config_option_key &opt_key, unsig
         return opt_floats_nullable->get_at(idx);
     } else {
         assert(false);
-        return 0;
+        static const double zero = 0.0;
+        return zero;
     }
 }
 

src/libslic3r/FilamentGroup.cpp

@@ -1021,7 +1021,7 @@ namespace Slic3r
             if (FGMode::MatchMode == ctx.group_info.mode)
                 return calc_filament_group_for_match(cost);
         }
-        catch (const FilamentGroupException& e) {
+        catch (const FilamentGroupException&) {
         }
 
         return calc_filament_group_for_flush(cost);

src/libslic3r/Format/STEP.cpp

@@ -712,7 +712,7 @@ unsigned int Step::get_triangle_num(double linear_deflection, double angle_defle
                 return 0;
             }
         }
-    } catch(const Exception &e) {
+    } catch(const Exception &) {
         return 0;
     }
     

src/libslic3r/OpenVDBUtils.cpp

@@ -1,4 +1,6 @@
+#ifndef NOMINMAX
 #define NOMINMAX
+#endif
 #include "OpenVDBUtils.hpp"
 
 #ifdef _MSC_VER

src/libslic3r/Preset.cpp

@@ -8,7 +8,9 @@
 
 #ifdef _MSC_VER
     #define WIN32_LEAN_AND_MEAN
+    #ifndef NOMINMAX
     #define NOMINMAX
+    #endif
     #include <Windows.h>
 #endif /* _MSC_VER */
 

src/libslic3r/SLA/SupportTreeBuilder.cpp

@@ -1,4 +1,6 @@
+#ifndef NOMINMAX
 #define NOMINMAX
+#endif
 
 #include <libslic3r/SLA/SupportTreeBuilder.hpp>
 #include <libslic3r/SLA/SupportTreeBuildsteps.hpp>