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Remove warning C4239: nonstandard extension used
* Eliminate warnings such as ...
`warning C4239: nonstandard extension used: 'argument': conversion
from 'DirItemIterator' to 'DirItemIterator &'`
`note: A non-const reference may only be bound to an lvalue`
* These are warnings that only occur with Warning Level == 4.
* This commit only deals with issues with mixing CString and String
data.
* Discard the PopString class, a self-admitted hack from
stackoverflow.com, that was simply confusing and not all that "pretty"
anyway.