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

Renamed ZMask to RoiSet, prototyped object classification methods that add classification result as a dataframe column

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

Corrected argument-forwarding error; set up job for porto data; split off ecotaxa TSV generation into its own module

Implemented check for multiple connected objects in mask frame, and optional restriction to the largest-area one; inference on autogenerated model now works with 100% accuracy when passing on training data