[feat]whole+ws2p1:improve module conf handling + ws2p1 add prefered keys

Cargo.lock

doc/en/dev/developing-a-durs-module.md

doc/fr/developpeurs/developper-un-module-durs.md

lib/core/conf/Cargo.toml

lib/core/conf/src/lib.rs

lib/core/core/Cargo.toml

lib/core/core/src/errors.rs

lib/core/core/src/lib.rs

lib/core/module/src/lib.rs

lib/modules/skeleton/lib.rs

lib/modules/tui/lib.rs

lib/modules/ws2p-v1-legacy/src/lib.rs

lib/modules/ws2p-v1-legacy/src/subcommands/mod.rs

lib/modules/ws2p-v1-legacy/src/subcommands/prefered.rs

lib/modules/ws2p/ws2p/src/lib.rs

lib/tools/crypto/src/keys/mod.rs