constantinpape/torch-em: Classification and domain adaptation functionality

What's Changed Implement MeanTeacher Trainer by @constantinpape in https://github.com/constantinpape/torch-em/pull/112 Add support for torch2 by @constantinpape in https://github.com/constantinpape/torch-em/pull/113 Update Prob-DA Source UNet Parameters by @anwai98 in https://github.com/constantinpape/torch-em/pull/115 New datasets and other changes by @constantinpape in https://github.com/constantinpape/torch-em/pull/114 Load utils by @constantinpape in https://github.com/constantinpape/torch-em/pull/117 Update Mean-Teacher and FixMatch Self-Training Scheme(s) by @anwai98 in https://github.com/constantinpape/torch-em/pull/116 Add all necessary tests for mean teacher trainer deserialization by @constantinpape in https://github.com/constantinpape/torch-em/pull/118 Add 2D Probabilistic UNet by @anwai98 in https://github.com/constantinpape/torch-em/pull/119 Add Argument - Target Domain by @anwai98 in https://github.com/constantinpape/torch-em/pull/121 Update Evaluation with Distribution Alignment by @anwai98 in https://github.com/constantinpape/torch-em/pull/122 Add 2D Probabilistic UNet Training Setup by @anwai98 in https://github.com/constantinpape/torch-em/pull/123 Add Probabilistic Self-Training (MT) Approaches by @anwai98 in https://github.com/constantinpape/torch-em/pull/125 Add FixMatch-based Probabilistic Domain Adaptation Setups by @anwai98 in https://github.com/constantinpape/torch-em/pull/126 Make livecell label extraction more robust against duplicate per obje… by @constantinpape in https://github.com/constantinpape/torch-em/pull/127 Add CLI for UNet training and prediction by @constantinpape in https://github.com/constantinpape/torch-em/pull/128 Implement tif support in data loaders by @constantinpape in https://github.com/constantinpape/torch-em/pull/130 Update Prediction Functions for PUNet Domain Adaptation Setups by @anwai98 in https://github.com/constantinpape/torch-em/pull/129 Implement classification functionality by @constantinpape in https://github.com/constantinpape/torch-em/pull/120 Full Changelog: https://github.com/constantinpape/torch-em/compare/0.4.1...0.5.