Alternative simple CLI for hippunfold

[akhanf]

Maybe have a way to support this kind of usage:

Very simple single image -> output folder CLI
(kind of like recon-all, except not implicitly using env var for subjects_dir)

hippunfold-<simple/single/subject/T1w> /path/to/my_input_t1.nii.gz /path/to/my/output_folder --subject 001 (--session ses)

internally, we would copy: my_input_t1.nii.gz to:
bids/sub-001/anat/sub-001_T1.nii.gz

output folder can be:
output_folder/sub-001

This might be best as a snakebids plugin.

plugin would need to know what are the required arguments, and how do they map to the app itself..