AuTA 2.0 master merge

Description

Merges development to master, preparing the release of AuTA 2.0

This merge contains the following issues:

• #116 (closed) - Feature - Download reports
• #119 (closed) - Enhancement - Fork Lizard and git clone into the workers
• #126 (closed) - Documentation - incorrect API documentation
• #152 (closed) - Bug - The security agent crashes on Windows
• #155 (closed) - Bug - Difference in method names across tools
• #158 (closed) - Feature - Template for adding AuTA to the GitLab CI
• #169 (closed) - Feature - Aggregated checker
• #170 (closed) - Feature - Export single submission
• #171 (closed) - Feature - Export all submissions by a student
• #172 (closed) - Feature - Export a full assignment
• #173 (closed) - Feature - Export assignment configurations
• #174 (closed) - Feature - Export core settings
• #177 (closed) - Bug - No test coverage for the full project
• #183 (closed) - Refactor - DatabaseConnection::getUser should return an Optional
• #186 (closed) - Bug - Test Smells outputs entire path
• #187 (closed) - Feature - Courses
• #188 (closed) - Bug - Trampoline gets a 404
• #190 (closed) - Bug - Pylint message ID
• #192 (closed) - Refactor - Change the names of the databases
• #193 (closed) - Feature - Basic assignment creation
• #194 (closed) - Feature - Core logs in UI
• #195 (closed) - Feature - Profanity checker
• #197 (closed) - Feature - Suppressions
• #198 (closed) - Feature - STREW metrics
• #199 (closed) - Bug - MethodNames with arrays and generics
• #201 (closed) - Bug - Report generator does not work anymore
• #205 (closed) - Bug - Generic metrics not loaded in the UI
• #206 (closed) - Bug - AuTA only searches the submission root for .auta.yml
• #210 (closed) - Redesign - HTML report is ugly
• #211 (closed) - Refactor - SIG - get 5 stars
• #212 (closed) - Bug - Non-ASCII character in branch name causes worker to crash
• #213 (closed) - Bug - CPM does not register approval or disapproval
• #214 (closed) - Bug - CPM report generation does not aggregate warnings and failures properly

And a lot of other, miscellaneous bug fixes.

Changes

A lot, see the issue list for details.

Additions

Also a lot, see the issue list for details.

Test and Review

To be filled in by the reviewers

• All of the methods are commented to expectation

• The methods are tested to satisfaction

• There are no unnecessary files present in the MR

• The continuous integration has no problems with the MR

• The MR is filled in as requested (including labels, milestones, and reviewers)

• The documentation is up-to-date

• All nullable parameters are marked as such