(io): remove module::io::atoms and use `io::session::SReader` and `io::session::SWriter` everywhere
Description
All in module::io::atoms::* are considered deprecated and should be replaced by module::io::session.
Proposal
- Delete module::io::atoms::*
- Patch all xml configuration to match use module::io::session::*
Outcomes
- less atoms in Sight, open the way to remove atoms entirely
Links / references
see #665 (closed)