Color coding for showing the right answers is unclear (6)

At this moment, Quizzard does show the correct answers in the front-end using 'lighter' colours, but this is very unclear in many cases (especially on beamers). The front-end should explicitly show the answer on statistics slides when available.

• Add a text field (based on SVG) that explicitly mentions the answer to a question (2).
• Investigate if there is a possibility to show the correct answer in the Graph by some other means than a lighter colour, implement if possible (3).
• Remove the functionality to make the correct answer lighter if the previous task has been implemented (1).