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Description
Introduces a base task handle (and job set) class. I noticed that NullTaskHandle and TaskHandle did not provide identical APIs so I used ABC base classes to do so. I also created a method to increment the count of a job set for autoimport and used that.
This will break any jobsets which didn't match the TaskHandle API.
Since the increment method is abstract, it will break jobsets without it as well. I can make it non-abstract but that seems like bad practice.
Checklist (delete if not relevant):