OWAs and dependencies

@mseaton, thanks for creating OWA-95 to add the ability to specify core & module versions to OWA manifests. I’ve tried to revise the ticket description to take into account your comments and @darius’ response. Could you take a peek at the ticket and, if you agree, change it to ready for work (or let me know and I will). Otherwise, if you think we still need design discussion, let me know and we’ll get it into the queue.