[Vm-dev] VMMaker MCM config and update

[David T. Lewis]

I believe that we now have a working configuration map for VMMaker and sundry plugins:

  MCMcmUpdater updateFromRepositories: #('http://squeaksource.com/VMMaker' )

Once loaded, updates can be requested with VMMaker class>>updateFromServer.

So far, the MCM consists of Andreas recipe, plus a few of my favorites. We'll
need to add references for other plugins needed for Mac OS, SqueakLand, etc.

Dave