Fixed some small standards things

Including:
- inconsistent `provider_orm.xml` filename
- using `*_class` parameters
- better use of the grouping character in services

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -