Replace nested instantiations of TCollection generic classes by NCollection templates

In context of #0024750, direct instantiations of generic classes from TCollection has been replaced by equivalent NCollection templates. However, instantiations that are nested to other generic classes could not be converted at the same time, due to limitations of CDL and WOK. Now since CDL is not used any more this replacement can be done for remaining instantiations.

Note that as a side effect, this fix will eliminate multiple compiler warnings produced by GCC with option -Wextra ("... base class 'TCollection_BaseSequence' should be explicitly initialized in the copy constructor")