[Userscript] Back To Back

[Kumirei]

V1.3.0 now supports three behavior settings

@Kumirei

• Repeat until correct: Like before, you repeat each item until you get both questions correct once
• Shuffle incorrect: If you answer a question correctly you get the other one right away, but if you answer a question incorrectly the item is put back in to the active queue and you’ll see it again whenever WK decides.
• True Back To Back: Like Shuffle incorrect, but you have to answer both questions correctly back to back to complete the review. (Thanks @rfindley for the idea) If you answer a question incorrectly, any correct answers are forgotten.