remove QT_{BEGIN|END}HEADER

Change-Id: Id30e6b75e5f682df5837f0e53f62bdb227f4323d
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
add missing QT_{BEGIN|END}_NAMESPACE

Change-Id: I4e5b1bd4dc4339c1ba5b2ef9cfb153f48fa84a5c
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
fix include warning

Change-Id: I920445947fb7bb3802f692a0b5aeab8d292120ef
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>