Small changes for auth
Add login
Merge branch 'db-services' into gui

Conflicts:
	operationManager/src/main/java/session/OperationManagerWebSession.java
	operationManager/src/main/java/webGui/IndexPage.java
Merge branch 'db-services' into gui
Change authentication to mock-service
Fix injection for login-mock
Testcommit
Fix injection für authentication service
Change name -> firstname and lastname in doctor
Add interface-method for selecting entity by username + password
Add authentication implementation
Add doctors and hospital to testdata
Fix bugs
opSlotService: Adapt query for doctor first and lastname
Clean up build path
Fix warnings