shdocvw: Implement IWebBrowser::ExecWB and IWebBrowser::QueryStatusWB.

[Erich Hoover]

Real Name:
    Erich Hoover
Description:
    This patch adds support for IWebBrowser(2)::ExecWB and
IWebBrowser(2)::QueryStatusWB by passing the requested operations
through to the IOleCommandTarget of either the container or the
document (where the container takes precedence over the document).
This functionality is particularly useful for applications that embed
the web-browser and provide printing functionality by calling
OLECMDID_PRINT (such as hhctrl.ocx), as described on MSDN in "Printing
the Current Page with the WebBrowser Control".
    In addition to now supporting QueryStatusWB, this patch has been
updated to permit passing commands to the container's
IOleCommandTarget and to provide several tests that demonstrate the
behavior of both ExecWB and QueryStatusWB.  Many thanks go to Jacek
Caban for patiently helping me put together these improvements.
ChangeLog:
    shdocvw: Implement IWebBrowser::ExecWB and IWebBrowser::QueryStatusWB.
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