WinInet Improvements

[Robert Shearman]

Hi,

This patch contains a bug fix for the Internet{Set,Query}Option functions. 
The hInternet parameter can be NULL for certain options, so we shouldn't do a 
global check. Also, I've added traces to all of the publicly callable 
functions.
This patch also contains a large number of Url Cache improvements. It now has 
a lot cleaner interface and support for multiple cache 'containers'. This 
allows support for retrieving info on cookies and history data from the 
relevant caches. Also supported are a lot of the unicode version of the 
functions.

Rob

Changelog:
- Url Cache Improvements
- In Internet{Set,Query}Option functions, hInternet can be NULL
- Add traces to Internet* functions

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