Allow lecturer to create level requirements for achievments
- Add a section for level requirements in achievements' _form
- Add a partial _lvl_req_row in requirements's views
Add logic to check for Level requirement before when calling Achievement#fulfilled_conditions?
Adjust the logic for achieving level requirement
Logic check for Level requirements
Create and render a level requirement requested during achievement creation
Show the correct info for a level requirements
Create a AJAX call when user create level requirement