remove 'name' attribute of Piece
refactor and add some comments
comments
select pieces by mouse passive motion
add showInfo, only select highlight-piece
define DEBUG_SHOW_INFO
init direction of pieces on road and home
move Field definition to class Piece
rotate piece that looking forward across road
use predictPosition as poiter
fix bug head direction of Piece when start
fix head direction of pieces when attack, piece moves to init pos