Adapted base segmentation worklow and API endpoint for generic semantic segmentation model; made dummy model this type too

Added superclass for instance segmentation models and modified ilastik object classification to inherit from it

Added superclass for semantic segmentation models and modified ilastik pixel classification to inherit from it

Delegated export of patch products to ZMaskObjectTable class; consolidated both batch runner and API-facing workflows into infer_object_map_from_zstack(); consolidated parameterization of export products into pydantic model

Validated non-duplication when loading ilastik model with same project file name, irrespective of path formatting

Start online validation of autogenerated model; but need to make inference model that takes binary inputs