Do not set the wmclass for toplevels. This MUST be unique across the application...

Do not set the wmclass for toplevels. This MUST be unique across the application, and GTK takes care of it for us
- don't screw it over.
Change it to set_role instead, but #if 0 out for now until some discussion about potential affect of this to
existing applications.
Toplevels that have a role set can be handled by the window manager, and store the positiong and size for them,
and restore it on later occasion. If apps do stupid things like don't have unique motif names set for different
toplevels, then this can cause problems with backwards compatibility. I am in favor of doing set_role, but it
needs a little discussion and testing.
Setting WM_CLASS is definately wrong, so just get rid of that till then.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39571 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775