Resolve "Refactor file up- and download"

What does this MR do (summary)?

Closes #51 (closed), #56 (closed)

• Paths are no longer assumed to be relative
• All paths can now be configured through the application.yaml
• Single files are no longer zipped
• Downloading multiple submissions is no longer a zip of zips, but rather just directories in a zip
• Downloading multiple submissions now gives a zip in the following format:

submissions.zip
    assignment_1/
        group_1/
            submission_1/
                file1.s
                file2.s
        group_2/
            submission_2/
                file.txt
    assignment_2/
        ...

Does this MR meet the acceptance criteria?

• The main application was run to make sure the server still runs without errors.
• Tests were written to verify the behaviour of this code.
• Javadoc and other comments were added to make the code understandable.
• The code adheres to the style guidelines.

added priohigh typeimprovement labels

added 1 commit

• c4c9694f - Redo submission uploading and downloading

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changed the description

added 1 commit

• 3b952344 - Redo submission uploading and downloading

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added 1 commit

• 0c8b0d9d - Redo submission uploading and downloading

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unmarked as a Work In Progress

added 1 commit

• 712a0d3b - Make file storage use only two directories

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added 4 commits

• 712a0d3b...25937dd7 - 2 commits from branch development
• ce7761b7 - Redo submission uploading and downloading
• 3a78591d - Make file storage use only two directories

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added 3 commits

• 5f87aa15 - Fix CI
• a66936de - Redo submission uploading and downloading
• f6139abc - Make file storage use only two directories

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added 8 commits

• f6139abc...39ca8996 - 6 commits from branch development
• 67861c1c - Redo submission uploading and downloading
• 65a2f5e4 - Make file storage use only two directories

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resolved all threads

approved this merge request

started a merge train

mentioned in commit c94d3f69

merged