Shortcut button for creating exam evaluation

[janno42]

A new button should be added to the actions column of the Evaluations tab of the staff semester page.
This button (with a fa-file-pen icon and the tooltip Create exam evaluation) should open a modal titled Create exam evaluation with a date input field (labeled Exam date) below the following text: Create an exam evaluation based on this evaluation. This will copy all the participants and contributors from the original evaluation. It will set the weight of the original evaluation to 9 and its end date will be set to the day before the exam.

When submitting the modal form (Create exam evaluation button), the following should happen:

• The weight of the evaluation at which the button was pressed (original evaluation) will be set to 9. If the evaluation has already been published, an error message is displayed (and nothing happens).
• If the original evaluation has not yet ended, the evaluation period end date will be set to the day before the one selected in the modal. If this date is before the start date, an error message is displayed (and nothing happens).
• A new evaluation will be created for the same course as the original evaluation (exam evaluation), will be named "Klausur/Exam", have a weight of 1, and be unrewarded.
• The start datetime of the exam evaluation is 08:00 on the day after the exam date defined in the modal.
• The end date of the exam evaluation is the third day after the exam date defined in the modal.
• All participants from the original evaluation will be copied to the exam evaluation.
• All contributors from the original evaluation will be copied to the exam evaluation without any assigned questionnaires.
• All questionnaires listed in a new settings variable EXAM_QUESTIONNAIRES (initially set to contain the id of the "Miscellaneous" questionnaire) will be added to the exam evaluation as general questionnaires.