Coding - Fix critical CodeQL static analysis warnings (#1074)

Interface_ParamSet:
- Eliminate use-after-free in Append() by deleting old buffer through
  a temp variable after reassigning the member pointer (CodeQL #5132/#2684)

delabella.cpp:
- Fix upcast array pointer arithmetic by parenthesizing cast to ensure
  pointer arithmetic uses derived class (Vert) size rather than base
  class (DelaBella_Vertex) size (CodeQL #5131)

NCollection_SparseArrayBase:
- Rework to replace virtual dispatch (createItem/destroyItem/copyItem)
  with function pointers passed as arguments to protected methods
- Store only DestroyItemFunc in base class to enable safe cleanup
  in destructor without virtual dispatch
- Pass CreateItemFunc and CopyItemFunc as arguments with zero
  per-instance storage overhead
- Move Clear() and UnsetValue() from base public API to protected
  clearItems()/unsetValue() with function pointer parameters;
  template class provides public wrappers
- Remove vtable entirely (no virtual methods remain)
- This eliminates the pure virtual call during base class destruction
  (CodeQL #5012)

AdvApp2Var_MathBase:
- Rewrite comparison to avoid potential signed integer overflow:
  *ncfnew + 1 > ncut becomes *ncfnew >= ncut (CodeQL #2692)

src/ModelingAlgorithms/TKMesh/BRepMesh/delabella.cpp

@@ -247,7 +247,7 @@ struct CDelaBella : IDelaBella
           errlog_proc(errlog_file,
                       "[WRN] all input points are colinear, returning single segment!\n");
         first_hull_vert    = vert_alloc + 0;
-        vert_alloc[0].next = (DelaBella_Vertex*)vert_alloc + 1;
+        vert_alloc[0].next = (DelaBella_Vertex*)(vert_alloc + 1);
         vert_alloc[1].next = nullptr;
       }
       else