More updates to get the various CAM modules to build on Windows.  This is the first point at which I've been able to make the whole project build on Windows.
Fixed typo in the UIManagerInst::makeCamFeature() method that was preventing the 'Add TPG' function from working.
Got it to the point where the TestPlugin loads alright but I it's not right yet.  I can't help wondering if I've made a mess of the plugin classes while trying to get this working.