[Cmake] MFC GUI rework

[Bill Hoffman]

I have reworked the MFC GUI a bit.

1. There are now three buttons:  Configure/OK/Cancel

Configure - Process the cmakelists.txt files and collect up cache values
OK - Create the Project files and exit cmake
Cancel - Exit cmake

2. After running configure, any new cache values are highlighted in red and
moved to the top of the list.

Please give it a try.

-Bill