Interpolation of shim profile maps on subject's data

[jcohenadad]

Discussion initiated in shimming-toolbox/shimming-toolbox#92 (comment).

The purpose of this issue is to discuss efficient ways to re-grid data from one coordinate system to another one, using fast and precise interpolation methods.

As we are looking into possibly moving to Python (which has extremely efficient re-gridding methods via nibabel libraries), I would wait before spending time implementing/modifying code in our current Matlab codebase.