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/SendSystemInfoDialog.cpp

@@ -1,4 +1,37 @@
 #include "SendSystemInfoDialog.hpp"
+#include <string>
+#include <wx/string.h>
+#include <wx/gdicmn.h>
+#include <wx/toplevel.h>
+#include <wx/textctrl.h>
+#include "libslic3r_version.h"
+#include <map>
+#include <cstddef>
+#include <cstdio>
+#include <stdio.h>
+#include <algorithm>
+#include <vector>
+#include <cstdint>
+#include <cstring>
+#include <iterator>
+#include <wx/language.h>
+#include <wx/intl.h>
+#include <wx/version.h>
+#include <cmath>
+#include <system_error>
+#include <utility>
+#include <boost/algorithm/string/classification.hpp>
+#include <boost/algorithm/string/constants.hpp>
+#include <functional>
+#include <boost/algorithm/string/trim.hpp>
+#include <sstream>
+#include <wx/dialog.h>
+#include "libslic3r/libslic3r.h"
+#include <cassert>
+#include <wx/colour.h>
+#include <wx/html/htmlwin.h>
+#include <wx/event.h>
+#include "slic3r/GUI/wxExtensions.hpp"
 
 #if __APPLE__
 #import <IOKit/IOKitLib.h>