core.sys.windows.windows and TCHAR

[Adam D. Ruppe]

Can we change this to alias wchar instead of char? While this 
would be a breaking change, the ASCII Windows functions are 
arguably always wrong to use with D since a D char* is NOT an 
ascii nor Windows encoded string, so any code it "breaks" was 
already (perhaps) broken and should be changed anyway.

I know there's other win32 bindings we can download, but for just 
the common types, I like to use the built in aliases, and TCHAR, 
TSTR, etc., are common in copy/pasted MSDN code and can easily be 
subtly wrong with this.

A compromise I'd accept is putting the wchar aliases under a 
version(Unicode) so it is opt-in.


Any objections to me making this change? If no I'll do a pull 
request.