Moving back to logical operators

• Set back restriction to "logical operators"
• shuffleAnswers is now part of the gameplay's options, the answers are no more shuffled in hardcore mode

After thinking about it, I finally decided to set back the restriction to logical operators. The player should be able to answer the questions and this game shouldn't be a pretext to feature JavaScript's quirks. I am also afraid that removing this limitation will cause the questions to become more "general" and less specific to JavaScript.