corba: update corba to fit in with the new-old event api

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
types: cleanup Sequence composition code

Allows reading xml files where the elements are nameless
instead of 'ElementN'.

Signed-off-by: Peter Soetens <peter@thesourceworks.com>
Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>