[WIP] Creates ObjectClassificationJobSpec and streamlines a lot of the job machinery

[Tomaz-Vieira]

With this PR one can fire two kinds of ilastik jobs using two different types of job specs: PixelClassificationJobSpec and ObjectClassificationJobSpec

Also, reworks a lot of the job running logic:

• Actually uses swift on the HPC to download and upload data -> no need for .tars anymore
• A lot of script cleanup, a lot of logic moved into utils.sh

TODO: Fix usage of the old IlastikJobSpec thoghout the code Implement frontend to create Object Classification Jobs