replace Slicethick nomenclature with SpatRz.

[grandjeanlab]

Is your feature request related to a problem? Please describe.
depending on how the images are reconstructed, the thickness may be encoded across the y or the z axis. currently aidaqc assumes it is on the z axis.

this is not the case for RAS or LPI encoded niftis.

afni 3dsample states the following
For example OR_CODE = LPI is the standard
'neuroscience' orientation, where the x-axis is
Left-to-Right, the y-axis is Posterior-to-Anterior,
and the z-axis is Inferior-to-Superior.

Describe the solution you'd like
replace slicethick to spatrz in all aidaqc outputs.