Issue #276 - replace TCHAR etc. with wide-character versions

Issue #276 - replace TCHAR etc. with wide-character versions

As part of the replacement of the ATL string classes with standard versions,
we replace TCHAR and all the other symbols with configuration-dependent
character sizes with their wide-character versions.

TCHAR --> wchar_t
_T("...") --> L"..."
_tcscmp --> wcscmp
_tcslwr_s --> _wcslwr_s
_tcsstr --> wcsstr

[Eric, 2014-07-26 18:56:02]

Note: This change set does not eliminate quite all the uses of the macro _T().
There are a handful of occurrences remaining inside the PassthroughAPP code. All
of them are within ATLTRACE or ATLASSERT, which themselves need to be rewritten
to finish off #276.

[sergei, 2014-07-28 09:27:02]

I've checked only the changes. Looks good.

[Oleksandr, 2014-08-05 11:29:54]

LGTM