[PATCH] msxml3/tests: Test VBSAXXMLReader.

[Jefferson Carpenter]

Summary:

* Generalized ContentHandler, ErrorHandler, and LexicalHandler 
implementations in test to not care about which interface is used.
* Implemented SAX.*Handler interfaces by calling into these generalized 
functions.
* Implemented VBSAX.*Handler interfaces the same way.
* Added vb_reader_support_data using VB interface IID_IVBSAXXMLReader.
* Added a data structure containing both reader_support_data and 
vb_reader_support_data.  This is iterated over first in test_saxreader().

The tests generally run.

thanks,
Jefferson