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/CAD/GeometryEngine.cpp

@@ -1,12 +1,25 @@
 #include "libslic3r/CAD/GeometryEngine.hpp"
+#include "libslic3r/Point.hpp"
+#include "libslic3r/TriangleMesh.hpp"
 
 #include <BRepMesh_IncrementalMesh.hxx>
 #include <BRep_Tool.hxx>
 #include <BRepAdaptor_Surface.hxx>
 #include <BRepLProp_SLProps.hxx>
+#include <TopAbs_ShapeEnum.hxx>
+#include <cstddef>
+#include <algorithm>
+#include <GeomAbs_SurfaceType.hxx>
+#include <TopAbs_Orientation.hxx>
+#include <Standard_Handle.hxx>
+#include <cstdint>
+#include <Poly_Triangle.hxx>
+#include <GeomAbs_CurveType.hxx>
 #include <gp_Cylinder.hxx>
 #include <BRepFilletAPI_MakeFillet.hxx>
 #include <BRepFilletAPI_MakeChamfer.hxx>
+#include <math.h>
+#include <gp_Mat.hxx>
 #include <stdexcept>
 #include <TopExp_Explorer.hxx>
 #include <TopoDS.hxx>
@@ -43,6 +56,9 @@
 #include <array>
 #include <map>
 #include <cmath>
+#include <vector>
+#include <string>
+#include <utility>
 
 namespace Slic3r {