Wininet: InternetReadFileEx Tests

[Robert Shearman]

ChangeLog:
- Improve callback to give context sensitive information about the 
different statuses and print the thread ID that it was called from.
- Replace the busy waiting on the "goon" flag with an event.
- Replace hard coded numbers with more informative constants throughout 
the InternetReadFile test.
- Add tests for InternetReadFileExA.
- Fix the error value from calling InternetReadFile with a NULL handle 
as indicated by the test.

-- 
Rob Shearman

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