Totalsegmentator

* bugfixes
* add lung_vessels model
* add intracerebral hemorrhage model
* add coronary artery model
* preview file was renamed from `preview.png` to `preview_total.png`
* Split very big images into 3 parts and process one by one to avoid memory problems
* fix: check if input is 4d and then truncate to 3d
* make it work with windows
* make it work with cpu

* make output spacing exactly match input spacing
* improve weights download

* fix SimpleITK version to 2.0.2 to avoid nifti loading error

* Optimise statistics runtime
* fix server bugs
* add radiomics feature calculation

* Initial release