(dicomIO): use the new Image, Mesh and Array API
Description
Refactor fwGdcmIO
, vtkGdcmIO
and fwDcmtkIO
to replace the old Image, Mesh and Array API with the new one (with iterators).
Proposal
Use the new iterators and the new API
Links / references
See !285 (merged), !273 (merged) and !254 (merged)