0024489: Avoid type casts in call to Standard::Free()

Method Standard::Free() is converted to template, so that pointer is nullified using its proper type.
Unnecessary type cases in calls to Standard::Free(), Standard::Reallocate(), and NCollection_BaseAllocator::Free() eliminated throughout OCCT code.

src/NCollection/NCollection_UtfString.hxx

@@ -232,9 +232,7 @@ private: //! @name low-level methods
   //! Release string buffer and nullify the pointer.
   static void strFree (Type*& thePtr)
   {
-    void* aPtr = thePtr;
-    Standard::Free (aPtr);
-    thePtr = NULL;
+    Standard::Free (thePtr);
   }
 
   //! Provides bytes interface to avoid incorrect pointer arithmetics.