Conformance tests for LoadStringW and LoadStringA

[Christopher]

Changes:
Added more tests for LoadStringW and LoadStringA

Details:
LoadStringW and LoadStringA deviate from standard Windows behavior. Both 
of them will return the length of the resource when passed a NULL 
pointer; however, this does not work under Windows. Also under Windows 
LoadStringW returns a pointer to the resource itself when passed a 
bufferlength of 0; this does not work under Wine. This is also the cause 
of bug #10932 <http://bugs.winehq.org/show_bug.cgi?id=10932>.
I wrote these tests to make it easier to check that LoadString is 
working properly, when someone has time to fix this. Fixing LoadStringW 
may be difficult as it is called in a lot of places in the Wine source, 
and each of these will need to be inspected since some rely on the call 
with NULL pointer behavior to get the resource length.

Christopher Berner
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