Add Missing Includes Across src/slic3r/GUI (#16048)

* Add Missing Includes Across src/slic3r/GUI

Every GUI source and header now directly includes the headers declaring what it uses, rather than relying on the precompiled header or transitive includes. Generated with clang-tidy misc-include-cleaner, plus one hand edit making CalibrationPanel.hpp self-contained.

* Drop the OS-Specific Includes Added Outside Their Platform Guards

GLib, GTK, D-Bus and POSIX headers are only used inside platform #if blocks, which already include them. Added unconditionally at the top of the file they broke the Windows build.

* Add the clang-tidy Configuration That Generated These Includes

Only misc-include-cleaner's missing-include check, with the headers it must never suggest: per-platform, internal and OS-specific ones that would break other platforms or are not meant to be included directly.

* Match Windows Paths in the clang-tidy Ignore List

Header paths use backslashes on Windows, so every / in a pattern is now [/\\]. The Windows SDK headers are ignored alongside the other OS-specific ones, and the list is one pattern per line. Suggested by @raistlin7447 from a Windows clang-cl run.

src/slic3r/GUI/GCodeViewer.cpp

@@ -28,6 +28,52 @@
 #include "libslic3r/Layer.hpp"
 #include "Widgets/ProgressDialog.hpp"
 #include "MsgDialog.hpp"
+#include <string>
+#include "libvgcode/include/Types.hpp"
+#include <vector>
+#include <utility>
+#include <cstdio>
+#include "libslic3r/Technologies.hpp"
+#include <imgui.h>
+#include "slic3r/GUI/ImGuiWrapper.hpp"
+#include "slic3r/GUI/GLModel.hpp"
+#include "slic3r/GUI/GLShader.hpp"
+#include "libslic3r/Point.hpp"
+#include <math.h>
+#include "libvgcode/include/Viewer.hpp"
+#include "libvgcode/include/PathVertex.hpp"
+#include <cstddef>
+#include <cstring>
+#include "slic3r/GUI/LibVGCode/LibVGCodeWrapper.hpp"
+#include <cassert>
+#include <cstdint>
+#include <boost/algorithm/string/classification.hpp>
+#include <boost/algorithm/string/constants.hpp>
+#include "slic3r/GUI/IMSlider.hpp"
+#include "libslic3r/Config.hpp"
+#include "libslic3r/Preset.hpp"
+#include <exception>
+#include <iterator>
+#include "libslic3r/GCode/GCodeProcessor.hpp"
+#include "libvgcode/include/GCodeInputData.hpp"
+#include "libvgcode/include/ColorRange.hpp"
+#include <optional>
+#include "libslic3r_version.h"
+#include <wx/busycursor.h>
+#include "libslic3r/Slicing.hpp"
+#include "slic3r/GUI/3DScene.hpp"
+#include "libslic3r/Color.hpp"
+#include <map>
+#include "libslic3r/PrintBase.hpp"
+#include <wx/event.h>
+#include <wx/string.h>
+#include <wx/slider.h>
+#include "libslic3r/PrintConfig.hpp"
+#include "slic3r/GUI/Event.hpp"
+#include <string_view>
+#include <functional>
+#include "libslic3r/CustomGCode.hpp"
+#include "libslic3r/ExtrusionEntity.hpp"
 
 #define IMGUI_DEFINE_MATH_OPERATORS