Remove Duplicate Includes and the Dead GCodeSender Sources (#16249)

46 files include the same header twice at file scope, outside any #if,
66 times in all:
Model.cpp included Model.hpp twice, Utils.hpp <algorithm> and
<string_view> twice, seven GUI headers <wx/dataview.h> and
<wx/artprov.h> twice. The second include of each is removed.

GCodeSender.cpp and GCodeSender.hpp have been commented out of
libslic3r/CMakeLists.txt since 2022 and their only two includes are
commented out as well. Both files go, with the commented lines, and
the CMake entry for SLA/SupportTreeIGL.cpp, a file that no longer
exists.

src/slic3r/GUI/BaseTransparentDPIFrame.cpp

@@ -18,7 +18,6 @@
 #include <wx/string.h>
 #include <wx/toplevel.h>
 #include <wx/timer.h>
-#include "Widgets/Button.hpp"
 #include "CapsuleButton.hpp"
 
 namespace Slic3r::GUI { struct IntEvent; }