#348 cleanup if Spring components

[marcoebbinghaus]

I did everything that was mentioned for that issue. The classes that still have an @Inject annotation can't be replaced trivially.

[Brutus5000]

Can you explain why / where you think replacing the constructor with @RequiredArgsConstructor is not possible?
As far as I can see the classes

• ClanService
• AchievementService
• ClansController
• FeaturedModEnricher
  do not do anything special in the constructor, so it should work here.

[marcoebbinghaus]

AchievementService: I think I just missed to replace the constructor here, sorry for that.
ClanService: The ClanServiceTest made usage of the constructor. But I removed the constructor and aligned the test now so it works without the constructor.
ClansController: I did replace the constructor here, what exactly do you miss?
FeaturedModEnricher: FeaturedModEnricher does not have a constructor and it only has a static field. I think Lombok annotations do not work with static fields ("All static fields will be skipped entirely (not considered for any of the generated methods, and no setter/getter will be made for them)." from https://projectlombok.org/features/Data).

I pushed the according changes.