QmlDesigner: Add rollback function to the RewriterTransaction class

Change-Id: I04874043eb04bd3f2cbf330186bb2105ed7ac82b
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner: Don't refresh bindings for reparenting for Quick 2.0

Change-Id: Id10fcc05c8ac9c0f635e3a02138bda76fd66599e
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner: Explicit constructors for commands

Change-Id: I3ea3db0d1c1b0fd19b0e89e7e435671f6f5e91af
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>