Pushed the clientglobalcontext.d.ts definitions into the main xrm.d.ts
(and associated version branches), to eliminate the need for manually
adjusting it to select the correct version, via its <reference> header.
This was simply a bad design choice on my part. Care should be taken,
though, to avoid using the "GetGlobalContext" method without having
first added ClientGlobalContext.js.aspx to the script sources of the
page--as always.
