Multiple jobs per instance + job for context

[asztalosdani]

Fixes #20 #38

[asztalosdani]

Continuing the conversation from #38

Since you probably would like to use separate Deadline plugins, in your case Maya ass export and Arnold standalone render, you would want to configure the plugin data as well.
How about having a instance.data["deadlineData"]["submissions"] which will be a list of dictionaries containing job and plugin entries?

Currently the instance.data["deadlineData"] is the list of dictionaries containing job and plugin entries.
The instance.data["deadlineData"]["submissions"] would break backward compatibility. Even if it's ok, I'm not convinced, because this way, the ["deadlineData"] has always exactly one, ["submissions"] entry.

[mottosso]

Nice one! @tokejepsen is the man behind the curtain on this one, will let him handle feedback and merging.

[tokejepsen]

The instance.data["deadlineData"]["submissions"] would break backward compatibility.

I don't quite understand why that would break backwards compatibility. instance.data["deadlineData"] is a dictionary, so adding another entry would be backwards compatible. Maybe there is something I'm not understanding?

We could also just have a completely new data member for submissions, like instance.data["deadlineSubmissions"] and context.data["deadlineSubmissions"]?
This maintained backwards compatibility and maybe be clearer for new people coming in?