Use references instead of pointers any time it's possible

- either take by const-ref
- or move values

This definition avoid useless conversions, is more robust (not a macro), and
it's hidden in an anonymous namespace for now (it should be moved into a
central _toolbox_ file)

- remove unused includes
- add missing ones (in the right file)
- reorder: OTB > ITK > 3rd part > STD

- harmonize indent and use latest OTB style (Allman's indenting style)
- remove trailling spaces

This commit doesn't need much attention. It serves to avoid extra noises in
futures commits that would automatically change indenting...

and rename the files to avoid conflict