[krbdev.mit.edu #8192] update ribbon implementation for accessibility

[Benjamin Kaduk via RT]

The KfW 4.0 series uses the ribbon interface provided by the MFC library, which does not expose 
control information to screen readers.  A design goal for the MIT Kerberos application is to be 
accessible, so we switched to using the ribbon interface provided by the windows SDK.  The 
following commits need to be pulled up to the 1.13 branch for the KfW 4.1 series:

8f89dc561c1e8464c423bde854b6fd4283497559
da60312f1352cbd82e39e31398f7ead2e817f119
025008dd215c20f804823dafa3bd9f45135be53e
fa5edf1e72b142f14d36b7eb304f55066c5af2f9
0fdbfb1891713b8ff91acba37dfb17b937929a71
3321375cf3830a4702fdea3781a07f9dde059edc