Since we can easily do that, just do it. No gurantee that we aren't
going to use rtti in the future.

Default to the baseName() of the .pro file.

One less need for qmakestep.

Transform the method in Qt4Project into a signal that is handled
by the run configurations themselves.

The runner uses the applicationlauncher internally, which is now
exported from the projectexplorer plugin for that reason.