Coding - Remove unused code and comments across various files (#968)

- Removed conditional compilation blocks (`#if 0`) that contained unused code in:
  - BRepTools_Modifier.cxx
  - AdvApp2Var_Data_f2c.hxx
  - AdvApp2Var_SysBase_baseinit.cxx
  - Extrema_FuncExtCS.cxx
  - Extrema_FuncExtSS.cxx
  - GeomProjLib.cxx
  - IntAna_IntLinTorus.cxx
  - IntAna2d_AnaIntersection_8.cxx
  - IntAna2d_Outils.cxx
  - ProjLib_CompProjectedCurve.cxx
  - ProjLib_ComputeApprox.cxx
  - ProjLib_ComputeApproxOnPolarSurface.cxx

- Cleaned up header files by ensuring proper end-of-file newlines in:
  - TKBRep_pch.hxx
  - GeomLib_Tool.hxx
  - MeshVS_SymmetricPairHasher.hxx
  - OpenGl_ShaderProgramDumpLevel.hxx
  - Graphic3d_ToneMappingMethod.hxx

src/ModelingData/TKBRep/BRepTools/BRepTools_Modifier.cxx

@@ -30,12 +30,6 @@
 #include <NCollection_DataMap.hxx>
 #include <NCollection_IndexedDataMap.hxx>
 
-#if 0
-  #include <Poly_Triangulation.hxx>
-  #include <Poly_Polygon3D.hxx>
-  #include <BRepMesh_IncrementalMesh.hxx>
-#endif
-
 #include <Geom2d_Line.hxx>
 #include <BRep_Builder.hxx>
 #include <BRep_Tool.hxx>

src/ModelingData/TKBRep/TKBRep_pch.hxx

@@ -29,4 +29,4 @@
 #include <BRep_Builder.hxx>
 #include <BRep_Tool.hxx>
 
-#endif // TKBRep_HXX
+#endif // TKBRep_HXX