[shogi-server] Enhance capability of Floodgate configuration file

[shogi-server] Enhance capability of Floodgate configuration file

- New parameter: Max_Moves, defined in the CSA protocol
  ex. set Max_Moves 256
- New parameter: Least_Time_Per_Move, defined in the CSA protocol
  ex. set Least_Time_Per_Move 0
- Proposed messages distributed to each player upon starting a new
  game will include Max_Moves as well as Least_Time_Per_Move.
- CSA files produced by the server will include settings of
  Max_Moves and Least_Time_Per_Move in comment lines as follows:
    'Max_Moves:256
    'Least_Time_Per_Move:0
- The official Shogi-server on wdoor.c.u-tokyo.ac.jp will
  be running with different parameters, depending on game names.
  a) Max_Moves will be 256 for floodgate-600-10 games;
     otherwise, 0.
  b) Least_Time_Per_Move will be 0 for floodgate-600-10 games;
     otherwise 1.
(Closes: #35839)