Implement Job system #24
Description
There should be a way to implement complex presets. These would be used the same as a regular preset, but they would actually apply multiple presets to an input file, or some chain actions on a file created by another preset.
Don't know what to call this yet, some ideas: "job", "workflow", "playbook".
Maybe these are extensions of Presets, which makes sense theoretically, but probably not practically without loads of refactoring.