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/TextureLibrary.cpp

@@ -1,8 +1,17 @@
 #include "TextureLibrary.hpp"
 
 #include <algorithm>
+#include <boost/filesystem/operations.hpp>
+#include <cstddef>
+#include <boost/filesystem/directory.hpp>
+#include <cstdint>
 #include <fstream>
+#include <ios>
+#include <iterator>
 #include <limits>
+#include <string>
+#include <optional>
+#include <memory>
 #include <unordered_map>
 
 #include <boost/algorithm/string/case_conv.hpp>
@@ -11,6 +20,9 @@
 #include <boost/nowide/fstream.hpp>
 #include <boost/system/error_code.hpp>
 
+#include <vector>
+#include <wx/gdicmn.h>
+#include <utility>
 #include <wx/image.h>
 #include <wx/mstream.h>