Add Job Import Export functionality

[rmetcalf9]

Later on I will add persistent store.
Even with this feature I will still want to be able to import jobs between instances.
export files will not contain GUIDs.

Add a function to will export all or selected jobs.
Export could be a JSON text file

Add a simular function to import jobs from a text file.
Import options:
Overwrite Duplicates
Replace Duplicates

Duplicates based on names. If imports are replaced executions are not deleted.