get_center_of_tile_cartesian_coordinate change to new coordinate system and ut fixed
SquareOrthogonal -> SquareDiagonal
get_entities_at_location and ut
change argument in get_all_possible_neighbour_locations from x, y to loc
get_all_possible_neighbour_locations return value ordered according to index; ut fix
check_straight_facing and ut
save 03/16