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/ModelingAlgorithms/TKMesh/BRepMesh/BRepMesh_DelaunayDeflectionControlMeshAlgo.hxx

@@ -364,16 +364,6 @@ private:
         return false;
       }
     }
-#if 0
-    else if (GeomLib::NormEstim(aSurf, theMidPoint, Precision::Confusion(), aNorm1) != 0)
-    {
-      // It is better to consider the singular point as a node of triangulation.
-      // However, it leads to hangs up meshing some faces (including faces with
-      // degenerated edges). E.g. tests "mesh standard_incmesh Q6".
-      // So, this code fragment is better to implement in the future.
-      return false;
-    }
-#endif
 
     return true;
   }