(IO): use the new Image, Mesh and Array API

What does this MR do?

Refactor fwVtkIO, fwItkIO, igtlProtocol and associated bundles to use the new Image, Mesh and Array API.
Fix Image iterator: the end of the const iterator was not correct.
Improve mesh iterator to allow point and cell colors with 3 components (RGB).

How to test it?

Launch the unit tests. Launch some applications, VRRender, PocRegistration, ....

Associated Issues/Merge Requests

• Issues
  • Fixes #416 (closed)