Open-Unmix 1.2.1

New features

• training script also allows to select a pre-trained model to be fine-tuned using the --model parameter #103
• a commandline progress bar has been added to see the progress for multiple tracks being separated #102

Breaking changes

• umxl is now selected as the new default model for inference using the commandline and the python API #97
• training argument --model has been renamed to --checkpoint.

Bug fixes

• addresses backend compatibility issues with sox_io on windows #93