The -T parameter to CMake may now be specified through cmake-gui via a
new text field in the first-time configure wizard (below the generator
chooser).
The generator factories specify whether or not they support toolsets.
This information is propagated to the Qt code and used to determine if
the selected generator should also display the optional Toolset widgets.
For bug #7191.
Improvements to the dialog that sets up the first configure.
Fixing the large size of it by breaking it up into a wizard.
Also incorporated suggestions from bug report.