refactoring bll classes and contracts
Merge branch 'refactoring' of https://github.com/Daria-Sakura/Super-Med-Service into refactoring

Conflicts:
	BLL/ReservationChecker.cs
	BLL/Resolvers/DoctorFullNameResolver.cs
	BLL/Resolvers/UserFullNameResolver.cs
	BLL/TicketsResolver.cs
	BLL/iTechArt.SuperMedService.Logic.csproj
	Super-Med-Service/Controllers/HomeController.cs
	Super-Med-Service/Hubs/BookerHub.cs
	Super-Med-Service/Hubs/ClientPushHub.cs
	Super-Med-Service/Hubs/DataHub.cs