clean up qbs-setup-toolchains.pro

Change-Id: I201751d1780f6bb411c773df2fcf10a9e5d37e4d
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
move MSVC info classes to separate file

Change-Id: I1f10d1eb87ed0fe67cd1b8bc79d8c76d229e98de
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>