[Bug 29583] New: JScript is missing 'new XMLHttpRequest();' support

http://bugs.winehq.org/show_bug.cgi?id=29583

Bug #: 29583
           Summary: JScript is missing 'new XMLHttpRequest();' support
           Product: Wine
           Version: 1.3.36
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P2
         Component: jscript
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

Found that while testing for bug 29574, builtin jscript won't create an object
using 'new XMLHttpRequest();'.

There's several important things needed to implement this properly:

- it wraps msxml functionality;
- ::open() is always asynchronous with readystate handlers installed;
- msxml object is called directly without IDispatch;
- url passed to ::open() is expanded from relative url before it's passed to
msxml, probably with same object site functionality that msxml uses.