Followup items from #3315 * [x] Add an explicit type for `PssParams` (there is already a start in x509_obj.cpp) * [x] Investigate what is wrong with Dilithium X.509 * [x] Remove `config_for_x509` * [x] Remove `EMSA1` class * [ ] Remove various `EMSA` Raw variants, replaced by using `RawHashFunction`