Allow 2-way integration to Jira FixVersion/s field from text field

Instead of having to integrate Aha! Release to Jira FixVersion/s, let Aha! text fields specify the name of a version and have it update the FixVersion in Jira based on a matched name. If no matched name exists, then throw an integration error just like you do with status transitions that don't exist in Jira, or when a Jira mandatory field isn't fulfilled.