Merge branch 'main' of https://gitlab.reutlingen-university.de/goerlita/op_planung

opp/core/src/main/java/OPStaffServiceImpl.java

opp/core/src/main/java/OperationServiceImpl.java

opp/core/src/main/java/OperationTeamImpl.java

opp/core/src/main/java/PreparationNote.java

opp/core/src/main/java/PreparationNoteCommand.java

opp/core/src/main/java/PreparationNoteImpl.java

opp/core/src/main/java/PreparationNoteService.java

opp/core/src/main/java/Repository.java

opp/core/src/main/java/Room.java

opp/core/src/main/java/RoomCommand.java

opp/core/src/main/java/RoomService.java

opp/core/src/main/java/RoomServiceImpl.java

opp/jdbc-repo-impl/src/main/java/JDBCRepository.java

opp/jdbc-repo-impl/src/test/java/Tests.java