removed unused code
simple test case for legal pawn moves generation
legal pawn move validation for simple cases
legal move generator cannot jump on opp tests
test for pawn move generation jumping over wall not possible
fixed test to jump over opponent
test for pawn move generation jumping left or right after hitting wall behind opp
test for jumping straight outside of board
test for pawn move generator cannot jump when blocked from all sides
test for not allowing side jump outside of board
removed some ugly code