QmlDesigner: Porting to Qt Quick 2

This patch ports our Qt Quick views to Qt Quick 2.

Change-Id: Ie0cfd81e7ebb76d2ed667211ad063feaaff5aa14
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>