Changes to formatting plus code cleanup

Renamed functions in Mapper classes

Controllers now use Mappers

Mappers implemented

Unit tests for TasklistMapper

Began implementing Mapper classes

Extensive changes to DTO model

Basic dtos for api

Implemented Tasklist.hasTasks() helper method

Fixed saving of tasks in createTasklist and added associated test

Extensive changes to entity model, services and associated tests.

Added throws decleraton to createTasklist test

Fixed missing @RequestBody in UserController.createUser

Added UnauthorizedException throwing to TakslistService though security is still rudimentary

Fixed access to JWT in token. Fixed comparisons in UserService to use equals()