OpenSpiel state methods: observation_string

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1. observation_string()

2. observation_string(player: int)

Returns a string representation of the observation, for (1) the current player, or (2) the specified player.

Examples:

import pyspiel

game = pyspiel.load_game("breakthrough")
state = game.new_initial_state()
print(state.action_to_string(0, 148))    # Output: e7f6
state.apply_action(148)

print(state.observation_string())
# Output:
# 8bbbbbbbb
# 7bbbb.bbb
# 6.....b..
# 5........
# 4........
# 3........
# 2wwwwwwww
# 1wwwwwwww
#  abcdefgh

# Perfect information game, same observation for both players.
print(state.observation_string(0))
# Output:
# 8bbbbbbbb
# 7bbbb.bbb
# 6.....b..
# 5........
# 4........
# 3........
# 2wwwwwwww
# 1wwwwwwww
#  abcdefgh