commit #43 - refactoring, adding Student graph

ompp-api/src/main/java/app/api/AuthController.java

ompp-api/src/main/java/app/api/LecturerController.java

ompp-api/src/main/java/app/pojo/StudentGraphDetails.java

...rc/main/java/app/repositories/AnswerEntityRepository.java

...java/app/repositories/StudentClassesEntityRepository.java

ompp-api/src/main/java/app/services/GraphDataService.java

ompp-api/src/main/resources/application.properties

...ChartComponents/ResponseChart/response-chart.component.ts

...tudentResponseChart/student-response-chart.component.html

.../StudentResponseChart/student-response-chart.component.ts

...urerDashboardComponents/lecturer-dashboard.component.html

...nents/LecturerPaperView/lecturer-paper-view.component.css

...nts/ViewPaperComponents/lecturer-view-paper.component.css

...ts/ViewPaperComponents/lecturer-view-paper.component.html

...ents/ViewPaperComponents/lecturer-view-paper.component.ts

ompp-web/src/app/LecturerComponents/lecturer-root.module.ts

...-web/src/app/LecturerComponents/lecturer-routes.module.ts

ompp-web/src/app/dao/StudentGraphDetails.dao.ts

ompp-web/src/app/dao/student-response.dao.ts

ompp-web/src/app/services/lecturer-info.service.ts