Moved chainer imports inside functions [no ci]

Enabled to disable multiprocessing for inference + disabled mp for app

added fix for handling one or none unique liver segments

Updated README

Added .nii.gz support

refactored to PEP8

filtered predicted vessels outside the predicted liver parenchyma region

changed tqdm for vessel seg for consistency

mp fix

potential multiprocessing fix for macos

fix for chainer inference when cupy is not installed and cpu is not specific

working solution

typo

potential fix for path

fix for deadlock issue on macOSX

refactoring, adding informative prints for liver vessel segmentation in log, which supports verbose mode

finally working. Now the CLI properly installs using pip and it can be used without any dependency issues across all relevant operating systems

tried importing Config directly, instead of the script

test

typo

worked, now have to add similar fix for all scripts

moved file to utils

Added option to segment the portal and hepatic veins (one class). Liver segmentation is now run in a separate Process, as TF is unable to clear the GPU manually - only when a session is killed, which is only when a Process is finished/killed.