Add Support For GUID in ToString representation of a cursor

Currently, when calling ToString() on a cursor, if it includes a Guid, the resulting output looks something like:

CSUUID("f7402520-3018-4b8e-9414-4d93a244f9b0")

We should add a shell friendly version of this output. At its most basic it is as simple as converting to a byte array then to a base64 encoded string.

var str = $"new BinData(3, \"{Convert.ToBase64String(guid.ToByteArray())}\")";