Modeling Data - Modernize LProp .gxx templates into .pxx utilities (#1155)

Replace legacy .gxx generic class templates (LProp_CLProps.gxx,
LProp_SLProps.gxx) with modern C++ .pxx template utilities
(LProp_CurveUtils.pxx, LProp_SurfaceUtils.pxx) using namespaced
template functions and access policies.

Remove obsolete CurveTool/SurfaceTool intermediary classes
(GeomLProp_CurveTool, GeomLProp_SurfaceTool, LProp3d_CurveTool,
LProp3d_SurfaceTool, BRepLProp_CurveTool) that are no longer needed
with the new direct/tool access policy design.

Replace per-instantiation _0.cxx files with standalone .cxx
implementations that delegate to the shared .pxx utilities.

Fix myCN field type from double to int in all CLProps headers
to match SLProps convention and actual usage (values 0 or 4).
Add default member initializers for uninitialized fields
(myCurvature, mySignificantFirstDerivativeOrder, myMinCurv,
myMaxCurv, myMeanCurv, myGausCurv) across all CLProps/SLProps classes.
Fix theSigOrder pass-by-value bug in Tangent/Curvature wrappers.
Fix typos: anUinfium/anVinfium -> anUinfimum/anVinfimum.

src/ModelingData/TKBRep/BRepLProp/BRepLProp_CLProps.hxx

@@ -33,7 +33,6 @@ class BRepAdaptor_Curve;
 class gp_Vec;
 class gp_Pnt;
 class gp_Dir;
-class BRepLProp_CurveTool;
 
 class BRepLProp_CLProps
 {
@@ -113,14 +112,14 @@ private:
   BRepAdaptor_Curve myCurve;
   double            myU;
   int               myDerOrder;
-  double            myCN;
+  int               myCN;
   double            myLinTol;
   gp_Pnt            myPnt;
   gp_Vec            myDerivArr[3];
   gp_Dir            myTangent;
-  double            myCurvature;
+  double            myCurvature = 0.0;
   LProp_Status      myTangentStatus;
-  int               mySignificantFirstDerivativeOrder;
+  int               mySignificantFirstDerivativeOrder = 0;
 };
 
 #endif // _BRepLProp_CLProps_HeaderFile