Reviewed-by: dt

This fixes the case that the user only compiles one debugging helper, and
the debug output was displayed although the compilation went fine.

Task-number: QTCREATORBUG-3711
Reviewed-by: ckamm

- Package installation and running untested yet.
- User currently needs to adapt %files section in spec file manually.
  We expect this task to be automated by the build script in the future
  (see http://bugs.meego.com/show_bug.cgi?id=13148).

The versions dialog now uses Utils::DetailsWidget to show the
general version information and (debugging) helper information.

The 'Helper Tools' can now be expanded to see each tools status
& recompile them selectively.

Task-number: QTCREATORBUG-2770

Make sure that the QtVersion object isn't referenced any more in
the separate thread: It might be deleted / altered while the thread is
running. Also let QmlDump use the class, instead of relying on it's
own implementation.

Reviewed-by: ckamm