Diamond fixes

[Wiebke]

This PR encompasses a number of fixes and extensions we came across while testing:

• Exports mask indices as a list of integers rather than a list of strings (this is also the way the model saves mask indices to Tiled)
• Adds the num_classes parameter to the inference job
• Extends the colormap by a gray color for unlabeled data and fixes a small bug in the color map scale when classes where deleted
• Autoscales the data with percentiles
• Passes the environment variables RESULTS_DIR as a new io parameter to the model as models_dir

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• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1207690415598274

[Wiebke]

Two additional changes that I just added here:

• Fix a bug with the result overlay toggle not correctly updating when results come in
• Disable keybinds for annotation and switching slices when the model controls accordion is opened. This means typing letters or numbers in those fields no longer leads to the annotation mode changing or slices updating unintentionally.

[Wiebke]

Great catches! The 1-9 key binds were indeed not working due to a mismatch in ordering of elements in the callback decorator and arguments in the callback function. I also fixed the issue with pan and zoom, made CrossEntropyLoss the default loss, and fixed a minor bug that prevented the mask export from functioning.

I could not reproduce the issue regarding switching annotation mode, but would suspect it was related to the two other issues. Could you retest?