Add nested items count to TabStats

[errante]

Since this data is accessible via Evaluator, could it also be added to the TabStats object please?
Right now, use ItemCollection.RemoveNested() just to know that data, has its own drawbacks, since it modifies all the other items collections due to how objects in jscript works.

Thanks.

[Jon]

We'll add that in the next update.

[errante]

Thanks!