Anki add-on: PGM-Arrow Keys Show Answer, Grade and Navigate

This addon allows to have arrow key mapped the way, that left, right, up and down arrows allow you to show the answer. It is super easy now to review: press right - shows the answer press right - it answers good and so on... you don't need to press ENTER, SPACE to show the answer. Arrow key - RIGHT - used for: show answer and answer GOOD Arrow key - UP - used for: show answer and answer EASY Arrow key - DOWN - used for: show answer and answer AGAIN Arrow key - LEFT - used for: UNDO Arrow key SHIFT DOWN - used for: show answer and answer HARD