Add Missing Includes Across src/libslic3r

Every libslic3r 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, with libslic3r headers spelled libslic3r/... so they resolve outside the library's private include paths. MultiMaterialSegmentation.hpp, Support/SupportParameters.hpp and Format/STEP.hpp are made self-contained by hand.

src/libslic3r/Fill/FillBase.cpp

@@ -1,7 +1,16 @@
+#include <algorithm>
+#include <cassert>
+#include <cfloat>
+#include <math.h>
+#include <limits>
+#include <cstdint>
 #include <stdio.h>
 #include <numeric>
 
 #include <cmath>
+#include <string>
+#include <vector>
+#include <utility>
 #include "../ClipperUtils.hpp"
 #include "../EdgeGrid.hpp"
 #include "../Geometry.hpp"
@@ -13,6 +22,12 @@
 #include "../VariableWidth.hpp"
 
 #include "FillBase.hpp"
+#include "libslic3r/Exception.hpp"
+#include "libslic3r/Config.hpp"
+#include "libslic3r/ExPolygon.hpp"
+#include "libslic3r/ExtrusionEntity.hpp"
+#include "libslic3r/ExtrusionEntityCollection.hpp"
+#include "libslic3r/BoundingBox.hpp"
 #include "FillConcentric.hpp"
 #include "FillSpiralInset.hpp"
 #include "FillHoneycomb.hpp"
@@ -28,6 +43,13 @@
 // BBS: new infill pattern header
 #include "FillConcentricInternal.hpp"
 #include "FillCrossHatch.hpp"
+#include "libslic3r/Polyline.hpp"
+#include "libslic3r/ShortestPath.hpp"
+#include "libslic3r/Line.hpp"
+#include "libslic3r/Polygon.hpp"
+#include "libslic3r/Utils.hpp"
+#include "clipper2/clipper.core.h"
+#include "clipper2/clipper.offset.h"
 // #define INFILL_DEBUG_OUTPUT
 
 namespace Slic3r {