Add problem title automatically

Selecting a problem in an exam now adds the title of the question.

Closes #50 (closed)

TODO:

• Check for title between a problem and the problem above it
• Check for the title below the student widget for the first problem
• Check the top of the page for a problem with no problem above it
• Move app_config
• Check from bottom of currently selected problem instead of top

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• c8de3d98...9df3d26b - 253 commits from branch develop
• 7ea35e5c - Resolved conflicts with develop

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• 479b40ac - Problem name is now updated in the frontend

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• 3c495be1 - Changed functionn name and changed doc

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Extracting the text currently takes ~40 ms on average.

marked as a Work In Progress

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• 27277f2b - Changed requirement from pdfminer.six to pdfminer3

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• 8b0ef988 - Changed imports to pdfminer3

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• d6115994 - Fixed compilation errors

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marked as a Work In Progress

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• 7b97f357 - PDF text extraction functions are now moved to its own file

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marked the checklist item Check for title between a problem and the problem above it as completed

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• 889cc520 - Fixed lint warning and removed commented out code

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• 5b3d2e2f - Small refactoring

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marked the checklist item Check the top of the page for a problem with no problem above it as completed

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• c9636743 - slight refactoring

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